Mercurial > hg > truffle
annotate src/share/vm/oops/constMethod.cpp @ 7465:37a3e8b7a1e9
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author | zgu |
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date | Tue, 08 Jan 2013 11:39:53 -0800 |
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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, | |
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42 u2 generic_signature_index, |
6934 | 43 MethodType method_type, |
44 TRAPS) { | |
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45 int size = ConstMethod::size(byte_code_size, |
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46 compressed_line_number_size, |
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47 localvariable_table_length, |
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48 exception_table_length, |
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49 checked_exceptions_length, |
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50 generic_signature_index); |
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51 return new (loader_data, size, true, THREAD) ConstMethod( |
6934 | 52 byte_code_size, compressed_line_number_size, localvariable_table_length, |
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53 exception_table_length, checked_exceptions_length, generic_signature_index, |
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54 method_type, size); |
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55 } |
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56 |
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57 ConstMethod::ConstMethod(int byte_code_size, |
6934 | 58 int compressed_line_number_size, |
59 int localvariable_table_length, | |
60 int exception_table_length, | |
61 int checked_exceptions_length, | |
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62 u2 generic_signature_index, |
6934 | 63 MethodType method_type, |
64 int size) { | |
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65 |
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66 No_Safepoint_Verifier no_safepoint; |
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67 set_interpreter_kind(Interpreter::invalid); |
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68 init_fingerprint(); |
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69 set_constants(NULL); |
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70 set_stackmap_data(NULL); |
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71 set_code_size(byte_code_size); |
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72 set_constMethod_size(size); |
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73 set_inlined_tables_length(generic_signature_index, |
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74 checked_exceptions_length, |
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75 compressed_line_number_size, |
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76 localvariable_table_length, |
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77 exception_table_length); |
6934 | 78 set_method_type(method_type); |
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79 assert(this->size() == size, "wrong size for object"); |
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80 } |
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81 |
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82 |
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83 // Deallocate metadata fields associated with ConstMethod* |
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84 void ConstMethod::deallocate_contents(ClassLoaderData* loader_data) { |
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85 set_interpreter_kind(Interpreter::invalid); |
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86 if (stackmap_data() != NULL) { |
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87 MetadataFactory::free_array<u1>(loader_data, stackmap_data()); |
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88 } |
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89 set_stackmap_data(NULL); |
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90 } |
0 | 91 |
92 // How big must this constMethodObject be? | |
93 | |
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94 int ConstMethod::size(int code_size, |
0 | 95 int compressed_line_number_size, |
96 int local_variable_table_length, | |
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97 int exception_table_length, |
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98 int checked_exceptions_length, |
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99 u2 generic_signature_index) { |
0 | 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 } | |
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113 if (exception_table_length > 0) { |
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114 extra_bytes += sizeof(u2); |
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115 extra_bytes += exception_table_length * sizeof(ExceptionTableElement); |
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116 } |
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117 if (generic_signature_index != 0) { |
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118 extra_bytes += sizeof(u2); |
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119 } |
0 | 120 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord; |
121 return align_object_size(header_size() + extra_words); | |
122 } | |
123 | |
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124 Method* ConstMethod::method() const { |
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125 return _constants->pool_holder()->method_with_idnum(_method_idnum); |
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126 } |
0 | 127 |
128 // linenumber table - note that length is unknown until decompression, | |
129 // see class CompressedLineNumberReadStream. | |
130 | |
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131 u_char* ConstMethod::compressed_linenumber_table() const { |
0 | 132 // Located immediately following the bytecodes. |
133 assert(has_linenumber_table(), "called only if table is present"); | |
134 return code_end(); | |
135 } | |
136 | |
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137 u2* ConstMethod::generic_signature_index_addr() const { |
0 | 138 // Located at the end of the constMethod. |
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139 assert(has_generic_signature(), "called only if generic signature exists"); |
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140 return last_u2_element(); |
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141 } |
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142 |
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143 u2* ConstMethod::checked_exceptions_length_addr() const { |
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144 // Located immediately before the generic signature index. |
0 | 145 assert(has_checked_exceptions(), "called only if table is present"); |
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146 return has_generic_signature() ? (last_u2_element() - 1) : |
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147 last_u2_element(); |
0 | 148 } |
149 | |
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150 u2* ConstMethod::exception_table_length_addr() const { |
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151 assert(has_exception_handler(), "called only if table is present"); |
0 | 152 if (has_checked_exceptions()) { |
153 // If checked_exception present, locate immediately before them. | |
154 return (u2*) checked_exceptions_start() - 1; | |
155 } else { | |
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156 // Else, the exception table is at the end of the constMethod or |
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157 // immediately before the generic signature index. |
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158 return has_generic_signature() ? (last_u2_element() - 1) : |
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159 last_u2_element(); |
0 | 160 } |
161 } | |
162 | |
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163 u2* ConstMethod::localvariable_table_length_addr() const { |
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164 assert(has_localvariable_table(), "called only if table is present"); |
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165 if (has_exception_handler()) { |
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166 // If exception_table present, locate immediately before them. |
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167 return (u2*) exception_table_start() - 1; |
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168 } else { |
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169 if (has_checked_exceptions()) { |
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170 // If checked_exception present, locate immediately before them. |
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171 return (u2*) checked_exceptions_start() - 1; |
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172 } else { |
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173 // Else, the linenumber table is at the end of the constMethod or |
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174 // immediately before the generic signature index. |
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175 return has_generic_signature() ? (last_u2_element() - 1) : |
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176 last_u2_element(); |
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177 } |
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178 } |
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179 } |
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180 |
0 | 181 // Update the flags to indicate the presence of these optional fields. |
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182 void ConstMethod::set_inlined_tables_length(u2 generic_signature_index, |
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183 int checked_exceptions_len, |
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184 int compressed_line_number_size, |
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185 int localvariable_table_len, |
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186 int exception_table_len) { |
0 | 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 } | |
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193 if (generic_signature_index != 0) { |
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194 _flags |= _has_generic_signature; |
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195 *(generic_signature_index_addr()) = generic_signature_index; |
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196 } |
0 | 197 if (checked_exceptions_len > 0) { |
198 _flags |= _has_checked_exceptions; | |
199 *(checked_exceptions_length_addr()) = checked_exceptions_len; | |
200 } | |
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201 if (exception_table_len > 0) { |
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202 _flags |= _has_exception_table; |
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203 *(exception_table_length_addr()) = exception_table_len; |
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204 } |
0 | 205 if (localvariable_table_len > 0) { |
206 _flags |= _has_localvariable_table; | |
207 *(localvariable_table_length_addr()) = localvariable_table_len; | |
208 } | |
209 } | |
210 | |
211 | |
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212 int ConstMethod::checked_exceptions_length() const { |
0 | 213 return has_checked_exceptions() ? *(checked_exceptions_length_addr()) : 0; |
214 } | |
215 | |
216 | |
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217 CheckedExceptionElement* ConstMethod::checked_exceptions_start() const { |
0 | 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 } | |
224 | |
225 | |
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226 int ConstMethod::localvariable_table_length() const { |
0 | 227 return has_localvariable_table() ? *(localvariable_table_length_addr()) : 0; |
228 } | |
229 | |
230 | |
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231 LocalVariableTableElement* ConstMethod::localvariable_table_start() const { |
0 | 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 } | |
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238 |
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239 int ConstMethod::exception_table_length() const { |
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240 return has_exception_handler() ? *(exception_table_length_addr()) : 0; |
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241 } |
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242 |
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243 ExceptionTableElement* ConstMethod::exception_table_start() const { |
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244 u2* addr = exception_table_length_addr(); |
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245 u2 length = *addr; |
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246 assert(length > 0, "should only be called if table is present"); |
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247 addr -= length * sizeof(ExceptionTableElement) / sizeof(u2); |
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248 return (ExceptionTableElement*)addr; |
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249 } |
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250 |
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251 |
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252 // Printing |
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253 |
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254 void ConstMethod::print_on(outputStream* st) const { |
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255 ResourceMark rm; |
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256 assert(is_constMethod(), "must be constMethod"); |
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257 st->print_cr(internal_name()); |
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258 st->print(" - method: " INTPTR_FORMAT " ", (address)method()); |
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259 method()->print_value_on(st); st->cr(); |
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260 if (has_stackmap_table()) { |
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261 st->print(" - stackmap data: "); |
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262 stackmap_data()->print_value_on(st); |
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263 st->cr(); |
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264 } |
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265 } |
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266 |
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267 // Short version of printing ConstMethod* - just print the name of the |
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268 // method it belongs to. |
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269 void ConstMethod::print_value_on(outputStream* st) const { |
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270 assert(is_constMethod(), "must be constMethod"); |
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271 st->print(" const part of method " ); |
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272 method()->print_value_on(st); |
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273 } |
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274 |
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275 |
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276 // Verification |
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277 |
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278 void ConstMethod::verify_on(outputStream* st) { |
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279 guarantee(is_constMethod(), "object must be constMethod"); |
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280 guarantee(is_metadata(), err_msg("Should be metadata " PTR_FORMAT, this)); |
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281 |
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282 // Verification can occur during oop construction before the method or |
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283 // other fields have been initialized. |
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284 guarantee(is_metadata(), err_msg("Should be metadata " PTR_FORMAT, this)); |
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285 guarantee(method()->is_method(), "should be method"); |
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286 |
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287 address m_end = (address)((oop*) this + size()); |
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288 address compressed_table_start = code_end(); |
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289 guarantee(compressed_table_start <= m_end, "invalid method layout"); |
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290 address compressed_table_end = compressed_table_start; |
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291 // Verify line number table |
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292 if (has_linenumber_table()) { |
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293 CompressedLineNumberReadStream stream(compressed_linenumber_table()); |
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294 while (stream.read_pair()) { |
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295 guarantee(stream.bci() >= 0 && stream.bci() <= code_size(), "invalid bci in line number table"); |
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296 } |
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297 compressed_table_end += stream.position(); |
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298 } |
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299 guarantee(compressed_table_end <= m_end, "invalid method layout"); |
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300 // Verify checked exceptions, exception table and local variable tables |
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301 if (has_checked_exceptions()) { |
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302 u2* addr = checked_exceptions_length_addr(); |
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303 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout"); |
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304 } |
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305 if (has_exception_handler()) { |
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306 u2* addr = exception_table_length_addr(); |
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307 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout"); |
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308 } |
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309 if (has_localvariable_table()) { |
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310 u2* addr = localvariable_table_length_addr(); |
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311 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout"); |
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312 } |
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313 // Check compressed_table_end relative to uncompressed_table_start |
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314 u2* uncompressed_table_start; |
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315 if (has_localvariable_table()) { |
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316 uncompressed_table_start = (u2*) localvariable_table_start(); |
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317 } else if (has_exception_handler()) { |
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318 uncompressed_table_start = (u2*) exception_table_start(); |
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319 } else if (has_checked_exceptions()) { |
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320 uncompressed_table_start = (u2*) checked_exceptions_start(); |
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321 } else { |
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322 uncompressed_table_start = (u2*) m_end; |
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323 } |
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324 int gap = (intptr_t) uncompressed_table_start - (intptr_t) compressed_table_end; |
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325 int max_gap = align_object_size(1)*BytesPerWord; |
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326 guarantee(gap >= 0 && gap < max_gap, "invalid method layout"); |
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327 } |