Mercurial > hg > graal-jvmci-8
annotate src/share/vm/oops/constMethod.cpp @ 6934:4735d2c84362
7200776: Implement default methods in interfaces
Summary: Add generic type analysis and default method selection algorithms
Reviewed-by: coleenp, acorn
author | kamg |
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date | Thu, 11 Oct 2012 12:25:42 -0400 |
parents | da91efe96a93 |
children | 18fb7da42534 |
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, |
6934 | 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) { | |
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44 int size = ConstMethod::size(byte_code_size, |
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45 compressed_line_number_size, |
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46 localvariable_table_length, |
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47 exception_table_length, |
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48 checked_exceptions_length); |
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49 return new (loader_data, size, true, THREAD) ConstMethod( |
6934 | 50 byte_code_size, compressed_line_number_size, localvariable_table_length, |
51 exception_table_length, checked_exceptions_length, method_type, size); | |
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52 } |
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53 |
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54 ConstMethod::ConstMethod(int byte_code_size, |
6934 | 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) { | |
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61 |
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62 No_Safepoint_Verifier no_safepoint; |
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63 set_interpreter_kind(Interpreter::invalid); |
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64 init_fingerprint(); |
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65 set_constants(NULL); |
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66 set_stackmap_data(NULL); |
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67 set_code_size(byte_code_size); |
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68 set_constMethod_size(size); |
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69 set_inlined_tables_length(checked_exceptions_length, |
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70 compressed_line_number_size, |
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71 localvariable_table_length, |
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72 exception_table_length); |
6934 | 73 set_method_type(method_type); |
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74 assert(this->size() == size, "wrong size for object"); |
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75 } |
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76 |
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77 |
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78 // Deallocate metadata fields associated with ConstMethod* |
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79 void ConstMethod::deallocate_contents(ClassLoaderData* loader_data) { |
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80 set_interpreter_kind(Interpreter::invalid); |
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81 if (stackmap_data() != NULL) { |
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82 MetadataFactory::free_array<u1>(loader_data, stackmap_data()); |
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83 } |
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84 set_stackmap_data(NULL); |
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85 } |
0 | 86 |
87 // How big must this constMethodObject be? | |
88 | |
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89 int ConstMethod::size(int code_size, |
0 | 90 int compressed_line_number_size, |
91 int local_variable_table_length, | |
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92 int exception_table_length, |
0 | 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 } | |
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107 if (exception_table_length > 0) { |
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108 extra_bytes += sizeof(u2); |
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109 extra_bytes += exception_table_length * sizeof(ExceptionTableElement); |
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110 } |
0 | 111 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord; |
112 return align_object_size(header_size() + extra_words); | |
113 } | |
114 | |
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115 Method* ConstMethod::method() const { |
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116 return InstanceKlass::cast(_constants->pool_holder())->method_with_idnum( |
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117 _method_idnum); |
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118 } |
0 | 119 |
120 // linenumber table - note that length is unknown until decompression, | |
121 // see class CompressedLineNumberReadStream. | |
122 | |
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123 u_char* ConstMethod::compressed_linenumber_table() const { |
0 | 124 // Located immediately following the bytecodes. |
125 assert(has_linenumber_table(), "called only if table is present"); | |
126 return code_end(); | |
127 } | |
128 | |
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129 u2* ConstMethod::checked_exceptions_length_addr() const { |
0 | 130 // Located at the end of the constMethod. |
131 assert(has_checked_exceptions(), "called only if table is present"); | |
132 return last_u2_element(); | |
133 } | |
134 | |
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135 u2* ConstMethod::exception_table_length_addr() const { |
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136 assert(has_exception_handler(), "called only if table is present"); |
0 | 137 if (has_checked_exceptions()) { |
138 // If checked_exception present, locate immediately before them. | |
139 return (u2*) checked_exceptions_start() - 1; | |
140 } else { | |
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141 // Else, the exception table is at the end of the constMethod. |
0 | 142 return last_u2_element(); |
143 } | |
144 } | |
145 | |
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146 u2* ConstMethod::localvariable_table_length_addr() const { |
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147 assert(has_localvariable_table(), "called only if table is present"); |
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148 if (has_exception_handler()) { |
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149 // If exception_table present, locate immediately before them. |
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150 return (u2*) exception_table_start() - 1; |
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151 } else { |
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152 if (has_checked_exceptions()) { |
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153 // If checked_exception present, locate immediately before them. |
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154 return (u2*) checked_exceptions_start() - 1; |
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155 } else { |
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156 // Else, the linenumber table is at the end of the constMethod. |
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157 return last_u2_element(); |
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158 } |
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159 } |
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160 } |
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161 |
0 | 162 |
163 // Update the flags to indicate the presence of these optional fields. | |
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164 void ConstMethod::set_inlined_tables_length( |
0 | 165 int checked_exceptions_len, |
166 int compressed_line_number_size, | |
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167 int localvariable_table_len, |
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168 int exception_table_len) { |
0 | 169 // Must be done in the order below, otherwise length_addr accessors |
170 // will not work. Only set bit in header if length is positive. | |
171 assert(_flags == 0, "Error"); | |
172 if (compressed_line_number_size > 0) { | |
173 _flags |= _has_linenumber_table; | |
174 } | |
175 if (checked_exceptions_len > 0) { | |
176 _flags |= _has_checked_exceptions; | |
177 *(checked_exceptions_length_addr()) = checked_exceptions_len; | |
178 } | |
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179 if (exception_table_len > 0) { |
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180 _flags |= _has_exception_table; |
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181 *(exception_table_length_addr()) = exception_table_len; |
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182 } |
0 | 183 if (localvariable_table_len > 0) { |
184 _flags |= _has_localvariable_table; | |
185 *(localvariable_table_length_addr()) = localvariable_table_len; | |
186 } | |
187 } | |
188 | |
189 | |
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190 int ConstMethod::checked_exceptions_length() const { |
0 | 191 return has_checked_exceptions() ? *(checked_exceptions_length_addr()) : 0; |
192 } | |
193 | |
194 | |
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195 CheckedExceptionElement* ConstMethod::checked_exceptions_start() const { |
0 | 196 u2* addr = checked_exceptions_length_addr(); |
197 u2 length = *addr; | |
198 assert(length > 0, "should only be called if table is present"); | |
199 addr -= length * sizeof(CheckedExceptionElement) / sizeof(u2); | |
200 return (CheckedExceptionElement*) addr; | |
201 } | |
202 | |
203 | |
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204 int ConstMethod::localvariable_table_length() const { |
0 | 205 return has_localvariable_table() ? *(localvariable_table_length_addr()) : 0; |
206 } | |
207 | |
208 | |
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209 LocalVariableTableElement* ConstMethod::localvariable_table_start() const { |
0 | 210 u2* addr = localvariable_table_length_addr(); |
211 u2 length = *addr; | |
212 assert(length > 0, "should only be called if table is present"); | |
213 addr -= length * sizeof(LocalVariableTableElement) / sizeof(u2); | |
214 return (LocalVariableTableElement*) addr; | |
215 } | |
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216 |
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217 int ConstMethod::exception_table_length() const { |
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218 return has_exception_handler() ? *(exception_table_length_addr()) : 0; |
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219 } |
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220 |
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221 ExceptionTableElement* ConstMethod::exception_table_start() const { |
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222 u2* addr = exception_table_length_addr(); |
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223 u2 length = *addr; |
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224 assert(length > 0, "should only be called if table is present"); |
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225 addr -= length * sizeof(ExceptionTableElement) / sizeof(u2); |
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226 return (ExceptionTableElement*)addr; |
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227 } |
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228 |
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229 |
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230 // Printing |
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231 |
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232 void ConstMethod::print_on(outputStream* st) const { |
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233 ResourceMark rm; |
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234 assert(is_constMethod(), "must be constMethod"); |
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235 st->print_cr(internal_name()); |
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236 st->print(" - method: " INTPTR_FORMAT " ", (address)method()); |
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237 method()->print_value_on(st); st->cr(); |
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238 if (has_stackmap_table()) { |
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239 st->print(" - stackmap data: "); |
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240 stackmap_data()->print_value_on(st); |
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241 st->cr(); |
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242 } |
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243 } |
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244 |
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245 // Short version of printing ConstMethod* - just print the name of the |
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246 // method it belongs to. |
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247 void ConstMethod::print_value_on(outputStream* st) const { |
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248 assert(is_constMethod(), "must be constMethod"); |
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249 st->print(" const part of method " ); |
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250 method()->print_value_on(st); |
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251 } |
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252 |
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253 |
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254 // Verification |
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255 |
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256 void ConstMethod::verify_on(outputStream* st) { |
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257 guarantee(is_constMethod(), "object must be constMethod"); |
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258 guarantee(is_metadata(), err_msg("Should be metadata " PTR_FORMAT, this)); |
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259 |
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260 // Verification can occur during oop construction before the method or |
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261 // other fields have been initialized. |
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262 guarantee(is_metadata(), err_msg("Should be metadata " PTR_FORMAT, this)); |
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263 guarantee(method()->is_method(), "should be method"); |
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264 |
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265 address m_end = (address)((oop*) this + size()); |
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266 address compressed_table_start = code_end(); |
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267 guarantee(compressed_table_start <= m_end, "invalid method layout"); |
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268 address compressed_table_end = compressed_table_start; |
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269 // Verify line number table |
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270 if (has_linenumber_table()) { |
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271 CompressedLineNumberReadStream stream(compressed_linenumber_table()); |
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272 while (stream.read_pair()) { |
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273 guarantee(stream.bci() >= 0 && stream.bci() <= code_size(), "invalid bci in line number table"); |
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274 } |
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275 compressed_table_end += stream.position(); |
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276 } |
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277 guarantee(compressed_table_end <= m_end, "invalid method layout"); |
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278 // Verify checked exceptions, exception table and local variable tables |
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279 if (has_checked_exceptions()) { |
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280 u2* addr = checked_exceptions_length_addr(); |
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281 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout"); |
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282 } |
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283 if (has_exception_handler()) { |
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284 u2* addr = exception_table_length_addr(); |
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285 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout"); |
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286 } |
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287 if (has_localvariable_table()) { |
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288 u2* addr = localvariable_table_length_addr(); |
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289 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout"); |
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290 } |
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291 // Check compressed_table_end relative to uncompressed_table_start |
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292 u2* uncompressed_table_start; |
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293 if (has_localvariable_table()) { |
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294 uncompressed_table_start = (u2*) localvariable_table_start(); |
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295 } else if (has_exception_handler()) { |
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296 uncompressed_table_start = (u2*) exception_table_start(); |
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297 } else if (has_checked_exceptions()) { |
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298 uncompressed_table_start = (u2*) checked_exceptions_start(); |
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299 } else { |
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300 uncompressed_table_start = (u2*) m_end; |
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301 } |
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302 int gap = (intptr_t) uncompressed_table_start - (intptr_t) compressed_table_end; |
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303 int max_gap = align_object_size(1)*BytesPerWord; |
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304 guarantee(gap >= 0 && gap < max_gap, "invalid method layout"); |
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305 } |