Mercurial > hg > truffle
annotate src/share/vm/classfile/vmSymbols.cpp @ 4001:5eb9169b1a14
7092712: JSR 292: unloaded invokedynamic call sites can lead to a crash with signature types not on BCP
Reviewed-by: jrose, never
author | twisti |
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date | Wed, 12 Oct 2011 21:00:13 -0700 |
parents | 72dee110246f |
children | fc9d8850ab8b |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2011, 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" |
26 #include "classfile/vmSymbols.hpp" | |
27 #include "memory/oopFactory.hpp" | |
28 #include "oops/oop.inline.hpp" | |
29 #include "runtime/handles.inline.hpp" | |
30 #include "utilities/xmlstream.hpp" | |
0 | 31 |
32 | |
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33 Symbol* vmSymbols::_symbols[vmSymbols::SID_LIMIT]; |
0 | 34 |
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35 Symbol* vmSymbols::_type_signatures[T_VOID+1] = { NULL /*, NULL...*/ }; |
0 | 36 |
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37 inline int compare_symbol(Symbol* a, Symbol* b) { |
0 | 38 if (a == b) return 0; |
39 // follow the natural address order: | |
40 return (address)a > (address)b ? +1 : -1; | |
41 } | |
42 | |
43 static vmSymbols::SID vm_symbol_index[vmSymbols::SID_LIMIT]; | |
44 extern "C" { | |
45 static int compare_vmsymbol_sid(const void* void_a, const void* void_b) { | |
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46 Symbol* a = vmSymbols::symbol_at(*((vmSymbols::SID*) void_a)); |
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47 Symbol* b = vmSymbols::symbol_at(*((vmSymbols::SID*) void_b)); |
0 | 48 return compare_symbol(a, b); |
49 } | |
50 } | |
51 | |
52 #ifndef PRODUCT | |
53 #define VM_SYMBOL_ENUM_NAME_BODY(name, string) #name "\0" | |
54 static const char* vm_symbol_enum_names = | |
55 VM_SYMBOLS_DO(VM_SYMBOL_ENUM_NAME_BODY, VM_ALIAS_IGNORE) | |
56 "\0"; | |
57 static const char* vm_symbol_enum_name(vmSymbols::SID sid) { | |
58 const char* string = &vm_symbol_enum_names[0]; | |
59 int skip = (int)sid - (int)vmSymbols::FIRST_SID; | |
60 for (; skip != 0; skip--) { | |
61 size_t skiplen = strlen(string); | |
62 if (skiplen == 0) return "<unknown>"; // overflow | |
63 string += skiplen+1; | |
64 } | |
65 return string; | |
66 } | |
67 #endif //PRODUCT | |
68 | |
69 // Put all the VM symbol strings in one place. | |
70 // Makes for a more compact libjvm. | |
71 #define VM_SYMBOL_BODY(name, string) string "\0" | |
72 static const char* vm_symbol_bodies = VM_SYMBOLS_DO(VM_SYMBOL_BODY, VM_ALIAS_IGNORE); | |
73 | |
74 void vmSymbols::initialize(TRAPS) { | |
75 assert((int)SID_LIMIT <= (1<<log2_SID_LIMIT), "must fit in this bitfield"); | |
76 assert((int)SID_LIMIT*5 > (1<<log2_SID_LIMIT), "make the bitfield smaller, please"); | |
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77 assert(vmIntrinsics::FLAG_LIMIT <= (1 << vmIntrinsics::log2_FLAG_LIMIT), "must fit in this bitfield"); |
0 | 78 |
79 if (!UseSharedSpaces) { | |
80 const char* string = &vm_symbol_bodies[0]; | |
81 for (int index = (int)FIRST_SID; index < (int)SID_LIMIT; index++) { | |
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82 Symbol* sym = SymbolTable::new_symbol(string, CHECK); |
0 | 83 _symbols[index] = sym; |
84 string += strlen(string); // skip string body | |
85 string += 1; // skip trailing null | |
86 } | |
87 | |
88 _type_signatures[T_BYTE] = byte_signature(); | |
89 _type_signatures[T_CHAR] = char_signature(); | |
90 _type_signatures[T_DOUBLE] = double_signature(); | |
91 _type_signatures[T_FLOAT] = float_signature(); | |
92 _type_signatures[T_INT] = int_signature(); | |
93 _type_signatures[T_LONG] = long_signature(); | |
94 _type_signatures[T_SHORT] = short_signature(); | |
95 _type_signatures[T_BOOLEAN] = bool_signature(); | |
96 _type_signatures[T_VOID] = void_signature(); | |
97 // no single signatures for T_OBJECT or T_ARRAY | |
98 } | |
99 | |
100 #ifdef ASSERT | |
101 // Check for duplicates: | |
102 for (int i1 = (int)FIRST_SID; i1 < (int)SID_LIMIT; i1++) { | |
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103 Symbol* sym = symbol_at((SID)i1); |
0 | 104 for (int i2 = (int)FIRST_SID; i2 < i1; i2++) { |
105 if (symbol_at((SID)i2) == sym) { | |
106 tty->print("*** Duplicate VM symbol SIDs %s(%d) and %s(%d): \"", | |
107 vm_symbol_enum_name((SID)i2), i2, | |
108 vm_symbol_enum_name((SID)i1), i1); | |
109 sym->print_symbol_on(tty); | |
110 tty->print_cr("\""); | |
111 } | |
112 } | |
113 } | |
114 #endif //ASSERT | |
115 | |
116 // Create an index for find_id: | |
117 { | |
118 for (int index = (int)FIRST_SID; index < (int)SID_LIMIT; index++) { | |
119 vm_symbol_index[index] = (SID)index; | |
120 } | |
121 int num_sids = SID_LIMIT-FIRST_SID; | |
122 qsort(&vm_symbol_index[FIRST_SID], num_sids, sizeof(vm_symbol_index[0]), | |
123 compare_vmsymbol_sid); | |
124 } | |
125 | |
126 #ifdef ASSERT | |
127 { | |
128 // Spot-check correspondence between strings, symbols, and enums: | |
129 assert(_symbols[NO_SID] == NULL, "must be"); | |
130 const char* str = "java/lang/Object"; | |
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131 TempNewSymbol jlo = SymbolTable::new_symbol(str, CHECK); |
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132 assert(strncmp(str, (char*)jlo->base(), jlo->utf8_length()) == 0, ""); |
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133 assert(jlo == java_lang_Object(), ""); |
0 | 134 SID sid = VM_SYMBOL_ENUM_NAME(java_lang_Object); |
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135 assert(find_sid(jlo) == sid, ""); |
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136 assert(symbol_at(sid) == jlo, ""); |
0 | 137 |
138 // Make sure find_sid produces the right answer in each case. | |
139 for (int index = (int)FIRST_SID; index < (int)SID_LIMIT; index++) { | |
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140 Symbol* sym = symbol_at((SID)index); |
0 | 141 sid = find_sid(sym); |
142 assert(sid == (SID)index, "symbol index works"); | |
143 // Note: If there are duplicates, this assert will fail. | |
144 // A "Duplicate VM symbol" message will have already been printed. | |
145 } | |
146 | |
147 // The string "format" happens (at the moment) not to be a vmSymbol, | |
148 // though it is a method name in java.lang.String. | |
149 str = "format"; | |
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150 TempNewSymbol fmt = SymbolTable::new_symbol(str, CHECK); |
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151 sid = find_sid(fmt); |
0 | 152 assert(sid == NO_SID, "symbol index works (negative test)"); |
153 } | |
154 #endif | |
155 } | |
156 | |
157 | |
158 #ifndef PRODUCT | |
159 const char* vmSymbols::name_for(vmSymbols::SID sid) { | |
160 if (sid == NO_SID) | |
161 return "NO_SID"; | |
162 const char* string = &vm_symbol_bodies[0]; | |
163 for (int index = (int)FIRST_SID; index < (int)SID_LIMIT; index++) { | |
164 if (index == (int)sid) | |
165 return string; | |
166 string += strlen(string); // skip string body | |
167 string += 1; // skip trailing null | |
168 } | |
169 return "BAD_SID"; | |
170 } | |
171 #endif | |
172 | |
173 | |
174 | |
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175 void vmSymbols::symbols_do(SymbolClosure* f) { |
0 | 176 for (int index = (int)FIRST_SID; index < (int)SID_LIMIT; index++) { |
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177 f->do_symbol(&_symbols[index]); |
0 | 178 } |
179 for (int i = 0; i < T_VOID+1; i++) { | |
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180 f->do_symbol(&_type_signatures[i]); |
0 | 181 } |
182 } | |
183 | |
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184 void vmSymbols::serialize(SerializeOopClosure* soc) { |
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185 soc->do_region((u_char*)&_symbols[FIRST_SID], |
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186 (SID_LIMIT - FIRST_SID) * sizeof(_symbols[0])); |
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187 soc->do_region((u_char*)_type_signatures, sizeof(_type_signatures)); |
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188 } |
0 | 189 |
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190 |
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191 BasicType vmSymbols::signature_type(Symbol* s) { |
0 | 192 assert(s != NULL, "checking"); |
193 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { | |
194 if (s == _type_signatures[i]) { | |
195 return (BasicType)i; | |
196 } | |
197 } | |
198 return T_OBJECT; | |
199 } | |
200 | |
201 | |
202 static int mid_hint = (int)vmSymbols::FIRST_SID+1; | |
203 | |
204 #ifndef PRODUCT | |
205 static int find_sid_calls, find_sid_probes; | |
206 // (Typical counts are calls=7000 and probes=17000.) | |
207 #endif | |
208 | |
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209 vmSymbols::SID vmSymbols::find_sid(Symbol* symbol) { |
0 | 210 // Handle the majority of misses by a bounds check. |
211 // Then, use a binary search over the index. | |
212 // Expected trip count is less than log2_SID_LIMIT, about eight. | |
213 // This is slow but acceptable, given that calls are not | |
214 // dynamically common. (methodOop::intrinsic_id has a cache.) | |
215 NOT_PRODUCT(find_sid_calls++); | |
216 int min = (int)FIRST_SID, max = (int)SID_LIMIT - 1; | |
217 SID sid = NO_SID, sid1; | |
218 int cmp1; | |
219 sid1 = vm_symbol_index[min]; | |
220 cmp1 = compare_symbol(symbol, symbol_at(sid1)); | |
221 if (cmp1 <= 0) { // before the first | |
222 if (cmp1 == 0) sid = sid1; | |
223 } else { | |
224 sid1 = vm_symbol_index[max]; | |
225 cmp1 = compare_symbol(symbol, symbol_at(sid1)); | |
226 if (cmp1 >= 0) { // after the last | |
227 if (cmp1 == 0) sid = sid1; | |
228 } else { | |
229 // After checking the extremes, do a binary search. | |
230 ++min; --max; // endpoints are done | |
231 int mid = mid_hint; // start at previous success | |
232 while (max >= min) { | |
233 assert(mid >= min && mid <= max, ""); | |
234 NOT_PRODUCT(find_sid_probes++); | |
235 sid1 = vm_symbol_index[mid]; | |
236 cmp1 = compare_symbol(symbol, symbol_at(sid1)); | |
237 if (cmp1 == 0) { | |
238 mid_hint = mid; | |
239 sid = sid1; | |
240 break; | |
241 } | |
242 if (cmp1 < 0) | |
243 max = mid - 1; // symbol < symbol_at(sid) | |
244 else | |
245 min = mid + 1; | |
246 | |
247 // Pick a new probe point: | |
248 mid = (max + min) / 2; | |
249 } | |
250 } | |
251 } | |
252 | |
253 #ifdef ASSERT | |
254 // Perform the exhaustive self-check the first 1000 calls, | |
255 // and every 100 calls thereafter. | |
256 static int find_sid_check_count = -2000; | |
257 if ((uint)++find_sid_check_count > (uint)100) { | |
258 if (find_sid_check_count > 0) find_sid_check_count = 0; | |
259 | |
260 // Make sure this is the right answer, using linear search. | |
261 // (We have already proven that there are no duplicates in the list.) | |
262 SID sid2 = NO_SID; | |
263 for (int index = (int)FIRST_SID; index < (int)SID_LIMIT; index++) { | |
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264 Symbol* sym2 = symbol_at((SID)index); |
0 | 265 if (sym2 == symbol) { |
266 sid2 = (SID)index; | |
267 break; | |
268 } | |
269 } | |
270 // Unless it's a duplicate, assert that the sids are the same. | |
271 if (_symbols[sid] != _symbols[sid2]) { | |
272 assert(sid == sid2, "binary same as linear search"); | |
273 } | |
274 } | |
275 #endif //ASSERT | |
276 | |
277 return sid; | |
278 } | |
279 | |
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280 vmSymbols::SID vmSymbols::find_sid(const char* symbol_name) { |
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281 Symbol* symbol = SymbolTable::probe(symbol_name, (int) strlen(symbol_name)); |
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282 if (symbol == NULL) return NO_SID; |
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283 return find_sid(symbol); |
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284 } |
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285 |
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286 static vmIntrinsics::ID wrapper_intrinsic(BasicType type, bool unboxing) { |
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287 #define TYPE2(type, unboxing) ((int)(type)*2 + ((unboxing) ? 1 : 0)) |
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288 switch (TYPE2(type, unboxing)) { |
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289 #define BASIC_TYPE_CASE(type, box, unbox) \ |
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290 case TYPE2(type, false): return vmIntrinsics::box; \ |
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291 case TYPE2(type, true): return vmIntrinsics::unbox |
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292 BASIC_TYPE_CASE(T_BOOLEAN, _Boolean_valueOf, _booleanValue); |
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293 BASIC_TYPE_CASE(T_BYTE, _Byte_valueOf, _byteValue); |
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294 BASIC_TYPE_CASE(T_CHAR, _Character_valueOf, _charValue); |
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295 BASIC_TYPE_CASE(T_SHORT, _Short_valueOf, _shortValue); |
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296 BASIC_TYPE_CASE(T_INT, _Integer_valueOf, _intValue); |
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297 BASIC_TYPE_CASE(T_LONG, _Long_valueOf, _longValue); |
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298 BASIC_TYPE_CASE(T_FLOAT, _Float_valueOf, _floatValue); |
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299 BASIC_TYPE_CASE(T_DOUBLE, _Double_valueOf, _doubleValue); |
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300 #undef BASIC_TYPE_CASE |
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301 } |
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302 #undef TYPE2 |
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303 return vmIntrinsics::_none; |
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304 } |
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305 |
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306 vmIntrinsics::ID vmIntrinsics::for_boxing(BasicType type) { |
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307 return wrapper_intrinsic(type, false); |
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308 } |
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309 vmIntrinsics::ID vmIntrinsics::for_unboxing(BasicType type) { |
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310 return wrapper_intrinsic(type, true); |
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311 } |
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312 |
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313 vmIntrinsics::ID vmIntrinsics::for_raw_conversion(BasicType src, BasicType dest) { |
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314 #define SRC_DEST(s,d) (((int)(s) << 4) + (int)(d)) |
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315 switch (SRC_DEST(src, dest)) { |
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316 case SRC_DEST(T_INT, T_FLOAT): return vmIntrinsics::_intBitsToFloat; |
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317 case SRC_DEST(T_FLOAT, T_INT): return vmIntrinsics::_floatToRawIntBits; |
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318 |
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319 case SRC_DEST(T_LONG, T_DOUBLE): return vmIntrinsics::_longBitsToDouble; |
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320 case SRC_DEST(T_DOUBLE, T_LONG): return vmIntrinsics::_doubleToRawLongBits; |
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321 } |
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322 #undef SRC_DEST |
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323 |
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324 return vmIntrinsics::_none; |
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325 } |
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326 |
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327 methodOop vmIntrinsics::method_for(vmIntrinsics::ID id) { |
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328 if (id == _none) return NULL; |
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329 Symbol* cname = vmSymbols::symbol_at(class_for(id)); |
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330 Symbol* mname = vmSymbols::symbol_at(name_for(id)); |
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331 Symbol* msig = vmSymbols::symbol_at(signature_for(id)); |
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332 if (cname == NULL || mname == NULL || msig == NULL) return NULL; |
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333 klassOop k = SystemDictionary::find_well_known_klass(cname); |
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334 if (k == NULL) return NULL; |
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335 return instanceKlass::cast(k)->find_method(mname, msig); |
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336 } |
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337 |
0 | 338 |
339 #define VM_INTRINSIC_INITIALIZE(id, klass, name, sig, flags) #id "\0" | |
340 static const char* vm_intrinsic_name_bodies = | |
341 VM_INTRINSICS_DO(VM_INTRINSIC_INITIALIZE, | |
342 VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE); | |
343 | |
344 static const char* vm_intrinsic_name_table[vmIntrinsics::ID_LIMIT]; | |
345 | |
346 const char* vmIntrinsics::name_at(vmIntrinsics::ID id) { | |
347 const char** nt = &vm_intrinsic_name_table[0]; | |
348 if (nt[_none] == NULL) { | |
349 char* string = (char*) &vm_intrinsic_name_bodies[0]; | |
350 for (int index = FIRST_ID; index < ID_LIMIT; index++) { | |
351 nt[index] = string; | |
352 string += strlen(string); // skip string body | |
353 string += 1; // skip trailing null | |
354 } | |
355 assert(!strcmp(nt[_hashCode], "_hashCode"), "lined up"); | |
356 nt[_none] = "_none"; | |
357 } | |
358 if ((uint)id < (uint)ID_LIMIT) | |
359 return vm_intrinsic_name_table[(uint)id]; | |
360 else | |
361 return "(unknown intrinsic)"; | |
362 } | |
363 | |
364 // These are flag-matching functions: | |
365 inline bool match_F_R(jshort flags) { | |
366 const int req = 0; | |
367 const int neg = JVM_ACC_STATIC | JVM_ACC_SYNCHRONIZED; | |
368 return (flags & (req | neg)) == req; | |
369 } | |
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370 inline bool match_F_Y(jshort flags) { |
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371 const int req = JVM_ACC_SYNCHRONIZED; |
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372 const int neg = JVM_ACC_STATIC; |
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373 return (flags & (req | neg)) == req; |
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374 } |
0 | 375 inline bool match_F_RN(jshort flags) { |
376 const int req = JVM_ACC_NATIVE; | |
377 const int neg = JVM_ACC_STATIC | JVM_ACC_SYNCHRONIZED; | |
378 return (flags & (req | neg)) == req; | |
379 } | |
380 inline bool match_F_S(jshort flags) { | |
381 const int req = JVM_ACC_STATIC; | |
382 const int neg = JVM_ACC_SYNCHRONIZED; | |
383 return (flags & (req | neg)) == req; | |
384 } | |
385 inline bool match_F_SN(jshort flags) { | |
386 const int req = JVM_ACC_STATIC | JVM_ACC_NATIVE; | |
387 const int neg = JVM_ACC_SYNCHRONIZED; | |
388 return (flags & (req | neg)) == req; | |
389 } | |
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390 inline bool match_F_RNY(jshort flags) { |
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391 const int req = JVM_ACC_NATIVE | JVM_ACC_SYNCHRONIZED; |
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392 const int neg = JVM_ACC_STATIC; |
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393 return (flags & (req | neg)) == req; |
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394 } |
0 | 395 |
396 // These are for forming case labels: | |
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397 #define ID3(x, y, z) (( jlong)(z) + \ |
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398 ((jlong)(y) << vmSymbols::log2_SID_LIMIT) + \ |
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399 ((jlong)(x) << (2*vmSymbols::log2_SID_LIMIT)) ) |
0 | 400 #define SID_ENUM(n) vmSymbols::VM_SYMBOL_ENUM_NAME(n) |
401 | |
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402 vmIntrinsics::ID vmIntrinsics::find_id_impl(vmSymbols::SID holder, |
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403 vmSymbols::SID name, |
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404 vmSymbols::SID sig, |
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405 jshort flags) { |
0 | 406 assert((int)vmSymbols::SID_LIMIT <= (1<<vmSymbols::log2_SID_LIMIT), "must fit"); |
407 | |
408 // Let the C compiler build the decision tree. | |
409 | |
410 #define VM_INTRINSIC_CASE(id, klass, name, sig, fcode) \ | |
411 case ID3(SID_ENUM(klass), SID_ENUM(name), SID_ENUM(sig)): \ | |
412 if (!match_##fcode(flags)) break; \ | |
413 return id; | |
414 | |
415 switch (ID3(holder, name, sig)) { | |
416 VM_INTRINSICS_DO(VM_INTRINSIC_CASE, | |
417 VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE); | |
418 } | |
419 return vmIntrinsics::_none; | |
420 | |
421 #undef VM_INTRINSIC_CASE | |
422 } | |
423 | |
424 | |
425 const char* vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID id, char* buf, int buflen) { | |
426 const char* str = name_at(id); | |
427 #ifndef PRODUCT | |
428 const char* kname = vmSymbols::name_for(class_for(id)); | |
429 const char* mname = vmSymbols::name_for(name_for(id)); | |
430 const char* sname = vmSymbols::name_for(signature_for(id)); | |
431 const char* fname = ""; | |
432 switch (flags_for(id)) { | |
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433 case F_Y: fname = "synchronized "; break; |
0 | 434 case F_RN: fname = "native "; break; |
435 case F_SN: fname = "native static "; break; | |
436 case F_S: fname = "static "; break; | |
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437 case F_RNY:fname = "native synchronized "; break; |
0 | 438 } |
439 const char* kptr = strrchr(kname, '/'); | |
440 if (kptr != NULL) kname = kptr + 1; | |
441 int len = jio_snprintf(buf, buflen, "%s: %s%s.%s%s", | |
442 str, fname, kname, mname, sname); | |
443 if (len < buflen) | |
444 str = buf; | |
445 #endif //PRODUCT | |
446 return str; | |
447 } | |
448 | |
449 | |
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450 // These are to get information about intrinsics. |
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451 |
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452 #define ID4(x, y, z, f) ((ID3(x, y, z) << vmIntrinsics::log2_FLAG_LIMIT) | (jlong) (f)) |
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453 |
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454 static const jlong intrinsic_info_array[vmIntrinsics::ID_LIMIT+1] = { |
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455 #define VM_INTRINSIC_INFO(ignore_id, klass, name, sig, fcode) \ |
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456 ID4(SID_ENUM(klass), SID_ENUM(name), SID_ENUM(sig), vmIntrinsics::fcode), |
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457 |
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458 0, VM_INTRINSICS_DO(VM_INTRINSIC_INFO, |
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459 VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE) |
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460 0 |
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461 #undef VM_INTRINSIC_INFO |
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462 }; |
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463 |
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464 inline jlong intrinsic_info(vmIntrinsics::ID id) { |
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465 return intrinsic_info_array[vmIntrinsics::ID_from((int)id)]; |
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466 } |
0 | 467 |
468 vmSymbols::SID vmIntrinsics::class_for(vmIntrinsics::ID id) { | |
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469 jlong info = intrinsic_info(id); |
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470 int shift = 2*vmSymbols::log2_SID_LIMIT + log2_FLAG_LIMIT, mask = right_n_bits(vmSymbols::log2_SID_LIMIT); |
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471 assert(((ID4(1021,1022,1023,15) >> shift) & mask) == 1021, ""); |
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472 return vmSymbols::SID( (info >> shift) & mask ); |
0 | 473 } |
474 | |
475 vmSymbols::SID vmIntrinsics::name_for(vmIntrinsics::ID id) { | |
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476 jlong info = intrinsic_info(id); |
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477 int shift = vmSymbols::log2_SID_LIMIT + log2_FLAG_LIMIT, mask = right_n_bits(vmSymbols::log2_SID_LIMIT); |
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478 assert(((ID4(1021,1022,1023,15) >> shift) & mask) == 1022, ""); |
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479 return vmSymbols::SID( (info >> shift) & mask ); |
0 | 480 } |
481 | |
482 vmSymbols::SID vmIntrinsics::signature_for(vmIntrinsics::ID id) { | |
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483 jlong info = intrinsic_info(id); |
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484 int shift = log2_FLAG_LIMIT, mask = right_n_bits(vmSymbols::log2_SID_LIMIT); |
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485 assert(((ID4(1021,1022,1023,15) >> shift) & mask) == 1023, ""); |
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486 return vmSymbols::SID( (info >> shift) & mask ); |
0 | 487 } |
488 | |
489 vmIntrinsics::Flags vmIntrinsics::flags_for(vmIntrinsics::ID id) { | |
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490 jlong info = intrinsic_info(id); |
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491 int shift = 0, mask = right_n_bits(log2_FLAG_LIMIT); |
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492 assert(((ID4(1021,1022,1023,15) >> shift) & mask) == 15, ""); |
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493 return Flags( (info >> shift) & mask ); |
0 | 494 } |
495 | |
496 | |
497 #ifndef PRODUCT | |
498 // verify_method performs an extra check on a matched intrinsic method | |
499 | |
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500 static bool match_method(methodOop m, Symbol* n, Symbol* s) { |
0 | 501 return (m->name() == n && |
502 m->signature() == s); | |
503 } | |
504 | |
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505 static vmIntrinsics::ID match_method_with_klass(methodOop m, Symbol* mk) { |
0 | 506 #define VM_INTRINSIC_MATCH(id, klassname, namepart, sigpart, flags) \ |
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507 { Symbol* k = vmSymbols::klassname(); \ |
0 | 508 if (mk == k) { \ |
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509 Symbol* n = vmSymbols::namepart(); \ |
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510 Symbol* s = vmSymbols::sigpart(); \ |
0 | 511 if (match_method(m, n, s)) \ |
512 return vmIntrinsics::id; \ | |
513 } } | |
514 VM_INTRINSICS_DO(VM_INTRINSIC_MATCH, | |
515 VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE); | |
516 return vmIntrinsics::_none; | |
517 #undef VM_INTRINSIC_MATCH | |
518 } | |
519 | |
520 void vmIntrinsics::verify_method(ID actual_id, methodOop m) { | |
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521 Symbol* mk = Klass::cast(m->method_holder())->name(); |
0 | 522 ID declared_id = match_method_with_klass(m, mk); |
523 | |
524 if (declared_id == actual_id) return; // success | |
525 | |
526 if (declared_id == _none && actual_id != _none && mk == vmSymbols::java_lang_StrictMath()) { | |
527 // Here are a few special cases in StrictMath not declared in vmSymbols.hpp. | |
528 switch (actual_id) { | |
529 case _min: | |
530 case _max: | |
531 case _dsqrt: | |
532 declared_id = match_method_with_klass(m, vmSymbols::java_lang_Math()); | |
533 if (declared_id == actual_id) return; // acceptable alias | |
534 break; | |
535 } | |
536 } | |
537 | |
538 const char* declared_name = name_at(declared_id); | |
539 const char* actual_name = name_at(actual_id); | |
540 methodHandle mh = m; | |
541 m = NULL; | |
542 ttyLocker ttyl; | |
543 if (xtty != NULL) { | |
544 xtty->begin_elem("intrinsic_misdeclared actual='%s' declared='%s'", | |
545 actual_name, declared_name); | |
546 xtty->method(mh); | |
547 xtty->end_elem(""); | |
548 } | |
549 if (PrintMiscellaneous && (WizardMode || Verbose)) { | |
550 tty->print_cr("*** misidentified method; %s(%d) should be %s(%d):", | |
551 declared_name, declared_id, actual_name, actual_id); | |
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552 mh()->print_short_name(tty); |
0 | 553 tty->cr(); |
554 } | |
555 } | |
556 #endif //PRODUCT |