Mercurial > hg > truffle
annotate src/share/vm/oops/constMethod.cpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author | coleenp |
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date | Sat, 01 Sep 2012 13:25:18 -0400 |
parents | src/share/vm/oops/constMethodOop.cpp@8150fa46d2ed |
children | 4735d2c84362 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
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26 #include "interpreter/interpreter.hpp" |
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27 #include "memory/gcLocker.hpp" |
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28 #include "memory/metadataFactory.hpp" |
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29 #include "oops/constMethod.hpp" |
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30 #include "oops/method.hpp" |
0 | 31 |
32 // Static initialization | |
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33 const u2 ConstMethod::MAX_IDNUM = 0xFFFE; |
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34 const u2 ConstMethod::UNSET_IDNUM = 0xFFFF; |
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35 |
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36 ConstMethod* ConstMethod::allocate(ClassLoaderData* loader_data, |
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37 int byte_code_size, |
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38 int compressed_line_number_size, |
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39 int localvariable_table_length, |
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40 int exception_table_length, |
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41 int checked_exceptions_length, |
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42 TRAPS) { |
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43 int size = ConstMethod::size(byte_code_size, |
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44 compressed_line_number_size, |
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45 localvariable_table_length, |
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46 exception_table_length, |
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47 checked_exceptions_length); |
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48 return new (loader_data, size, true, THREAD) ConstMethod( |
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49 byte_code_size, compressed_line_number_size, |
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50 localvariable_table_length, exception_table_length, |
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51 checked_exceptions_length, size); |
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52 } |
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53 |
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54 ConstMethod::ConstMethod(int byte_code_size, |
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55 int compressed_line_number_size, |
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56 int localvariable_table_length, |
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57 int exception_table_length, |
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58 int checked_exceptions_length, |
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59 int size) { |
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60 |
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61 No_Safepoint_Verifier no_safepoint; |
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62 set_interpreter_kind(Interpreter::invalid); |
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63 init_fingerprint(); |
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64 set_constants(NULL); |
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65 set_stackmap_data(NULL); |
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66 set_code_size(byte_code_size); |
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67 set_constMethod_size(size); |
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68 set_inlined_tables_length(checked_exceptions_length, |
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69 compressed_line_number_size, |
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70 localvariable_table_length, |
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71 exception_table_length); |
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72 assert(this->size() == size, "wrong size for object"); |
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73 } |
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74 |
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75 |
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76 // Deallocate metadata fields associated with ConstMethod* |
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77 void ConstMethod::deallocate_contents(ClassLoaderData* loader_data) { |
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78 set_interpreter_kind(Interpreter::invalid); |
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79 if (stackmap_data() != NULL) { |
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80 MetadataFactory::free_array<u1>(loader_data, stackmap_data()); |
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81 } |
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82 set_stackmap_data(NULL); |
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83 } |
0 | 84 |
85 // How big must this constMethodObject be? | |
86 | |
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87 int ConstMethod::size(int code_size, |
0 | 88 int compressed_line_number_size, |
89 int local_variable_table_length, | |
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90 int exception_table_length, |
0 | 91 int checked_exceptions_length) { |
92 int extra_bytes = code_size; | |
93 if (compressed_line_number_size > 0) { | |
94 extra_bytes += compressed_line_number_size; | |
95 } | |
96 if (checked_exceptions_length > 0) { | |
97 extra_bytes += sizeof(u2); | |
98 extra_bytes += checked_exceptions_length * sizeof(CheckedExceptionElement); | |
99 } | |
100 if (local_variable_table_length > 0) { | |
101 extra_bytes += sizeof(u2); | |
102 extra_bytes += | |
103 local_variable_table_length * sizeof(LocalVariableTableElement); | |
104 } | |
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105 if (exception_table_length > 0) { |
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106 extra_bytes += sizeof(u2); |
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107 extra_bytes += exception_table_length * sizeof(ExceptionTableElement); |
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108 } |
0 | 109 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord; |
110 return align_object_size(header_size() + extra_words); | |
111 } | |
112 | |
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113 Method* ConstMethod::method() const { |
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114 return InstanceKlass::cast(_constants->pool_holder())->method_with_idnum( |
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115 _method_idnum); |
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116 } |
0 | 117 |
118 // linenumber table - note that length is unknown until decompression, | |
119 // see class CompressedLineNumberReadStream. | |
120 | |
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121 u_char* ConstMethod::compressed_linenumber_table() const { |
0 | 122 // Located immediately following the bytecodes. |
123 assert(has_linenumber_table(), "called only if table is present"); | |
124 return code_end(); | |
125 } | |
126 | |
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127 u2* ConstMethod::checked_exceptions_length_addr() const { |
0 | 128 // Located at the end of the constMethod. |
129 assert(has_checked_exceptions(), "called only if table is present"); | |
130 return last_u2_element(); | |
131 } | |
132 | |
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133 u2* ConstMethod::exception_table_length_addr() const { |
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134 assert(has_exception_handler(), "called only if table is present"); |
0 | 135 if (has_checked_exceptions()) { |
136 // If checked_exception present, locate immediately before them. | |
137 return (u2*) checked_exceptions_start() - 1; | |
138 } else { | |
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139 // Else, the exception table is at the end of the constMethod. |
0 | 140 return last_u2_element(); |
141 } | |
142 } | |
143 | |
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144 u2* ConstMethod::localvariable_table_length_addr() const { |
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145 assert(has_localvariable_table(), "called only if table is present"); |
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146 if (has_exception_handler()) { |
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147 // If exception_table present, locate immediately before them. |
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148 return (u2*) exception_table_start() - 1; |
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149 } else { |
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150 if (has_checked_exceptions()) { |
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151 // If checked_exception present, locate immediately before them. |
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152 return (u2*) checked_exceptions_start() - 1; |
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153 } else { |
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154 // Else, the linenumber table is at the end of the constMethod. |
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155 return last_u2_element(); |
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156 } |
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157 } |
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158 } |
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159 |
0 | 160 |
161 // Update the flags to indicate the presence of these optional fields. | |
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162 void ConstMethod::set_inlined_tables_length( |
0 | 163 int checked_exceptions_len, |
164 int compressed_line_number_size, | |
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165 int localvariable_table_len, |
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166 int exception_table_len) { |
0 | 167 // Must be done in the order below, otherwise length_addr accessors |
168 // will not work. Only set bit in header if length is positive. | |
169 assert(_flags == 0, "Error"); | |
170 if (compressed_line_number_size > 0) { | |
171 _flags |= _has_linenumber_table; | |
172 } | |
173 if (checked_exceptions_len > 0) { | |
174 _flags |= _has_checked_exceptions; | |
175 *(checked_exceptions_length_addr()) = checked_exceptions_len; | |
176 } | |
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177 if (exception_table_len > 0) { |
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178 _flags |= _has_exception_table; |
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179 *(exception_table_length_addr()) = exception_table_len; |
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180 } |
0 | 181 if (localvariable_table_len > 0) { |
182 _flags |= _has_localvariable_table; | |
183 *(localvariable_table_length_addr()) = localvariable_table_len; | |
184 } | |
185 } | |
186 | |
187 | |
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188 int ConstMethod::checked_exceptions_length() const { |
0 | 189 return has_checked_exceptions() ? *(checked_exceptions_length_addr()) : 0; |
190 } | |
191 | |
192 | |
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193 CheckedExceptionElement* ConstMethod::checked_exceptions_start() const { |
0 | 194 u2* addr = checked_exceptions_length_addr(); |
195 u2 length = *addr; | |
196 assert(length > 0, "should only be called if table is present"); | |
197 addr -= length * sizeof(CheckedExceptionElement) / sizeof(u2); | |
198 return (CheckedExceptionElement*) addr; | |
199 } | |
200 | |
201 | |
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202 int ConstMethod::localvariable_table_length() const { |
0 | 203 return has_localvariable_table() ? *(localvariable_table_length_addr()) : 0; |
204 } | |
205 | |
206 | |
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207 LocalVariableTableElement* ConstMethod::localvariable_table_start() const { |
0 | 208 u2* addr = localvariable_table_length_addr(); |
209 u2 length = *addr; | |
210 assert(length > 0, "should only be called if table is present"); | |
211 addr -= length * sizeof(LocalVariableTableElement) / sizeof(u2); | |
212 return (LocalVariableTableElement*) addr; | |
213 } | |
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214 |
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215 int ConstMethod::exception_table_length() const { |
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216 return has_exception_handler() ? *(exception_table_length_addr()) : 0; |
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217 } |
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218 |
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219 ExceptionTableElement* ConstMethod::exception_table_start() const { |
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220 u2* addr = exception_table_length_addr(); |
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221 u2 length = *addr; |
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222 assert(length > 0, "should only be called if table is present"); |
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223 addr -= length * sizeof(ExceptionTableElement) / sizeof(u2); |
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224 return (ExceptionTableElement*)addr; |
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225 } |
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226 |
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227 |
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228 // Printing |
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229 |
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230 void ConstMethod::print_on(outputStream* st) const { |
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231 ResourceMark rm; |
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232 assert(is_constMethod(), "must be constMethod"); |
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233 st->print_cr(internal_name()); |
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234 st->print(" - method: " INTPTR_FORMAT " ", (address)method()); |
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235 method()->print_value_on(st); st->cr(); |
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236 if (has_stackmap_table()) { |
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237 st->print(" - stackmap data: "); |
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238 stackmap_data()->print_value_on(st); |
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239 st->cr(); |
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240 } |
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241 } |
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242 |
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243 // Short version of printing ConstMethod* - just print the name of the |
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244 // method it belongs to. |
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245 void ConstMethod::print_value_on(outputStream* st) const { |
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246 assert(is_constMethod(), "must be constMethod"); |
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247 st->print(" const part of method " ); |
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248 method()->print_value_on(st); |
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249 } |
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250 |
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251 |
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252 // Verification |
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253 |
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254 void ConstMethod::verify_on(outputStream* st) { |
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255 guarantee(is_constMethod(), "object must be constMethod"); |
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256 guarantee(is_metadata(), err_msg("Should be metadata " PTR_FORMAT, this)); |
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257 |
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258 // Verification can occur during oop construction before the method or |
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259 // other fields have been initialized. |
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260 guarantee(is_metadata(), err_msg("Should be metadata " PTR_FORMAT, this)); |
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261 guarantee(method()->is_method(), "should be method"); |
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262 |
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263 address m_end = (address)((oop*) this + size()); |
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264 address compressed_table_start = code_end(); |
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265 guarantee(compressed_table_start <= m_end, "invalid method layout"); |
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266 address compressed_table_end = compressed_table_start; |
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267 // Verify line number table |
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268 if (has_linenumber_table()) { |
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269 CompressedLineNumberReadStream stream(compressed_linenumber_table()); |
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270 while (stream.read_pair()) { |
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271 guarantee(stream.bci() >= 0 && stream.bci() <= code_size(), "invalid bci in line number table"); |
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272 } |
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273 compressed_table_end += stream.position(); |
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274 } |
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275 guarantee(compressed_table_end <= m_end, "invalid method layout"); |
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276 // Verify checked exceptions, exception table and local variable tables |
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277 if (has_checked_exceptions()) { |
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278 u2* addr = checked_exceptions_length_addr(); |
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279 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout"); |
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280 } |
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281 if (has_exception_handler()) { |
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282 u2* addr = exception_table_length_addr(); |
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283 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout"); |
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284 } |
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285 if (has_localvariable_table()) { |
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286 u2* addr = localvariable_table_length_addr(); |
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287 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout"); |
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288 } |
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289 // Check compressed_table_end relative to uncompressed_table_start |
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290 u2* uncompressed_table_start; |
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291 if (has_localvariable_table()) { |
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292 uncompressed_table_start = (u2*) localvariable_table_start(); |
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293 } else if (has_exception_handler()) { |
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294 uncompressed_table_start = (u2*) exception_table_start(); |
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295 } else if (has_checked_exceptions()) { |
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296 uncompressed_table_start = (u2*) checked_exceptions_start(); |
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297 } else { |
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298 uncompressed_table_start = (u2*) m_end; |
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299 } |
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300 int gap = (intptr_t) uncompressed_table_start - (intptr_t) compressed_table_end; |
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301 int max_gap = align_object_size(1)*BytesPerWord; |
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302 guarantee(gap >= 0 && gap < max_gap, "invalid method layout"); |
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303 } |