Mercurial > hg > truffle
annotate src/share/vm/oops/cpCache.hpp @ 9083:9befe2fce567
8011972: Field can be erroneously marked as contended when @Contended annotation isn't present
Reviewed-by: kvn, kmo, shade
author | vlivanov |
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date | Thu, 11 Apr 2013 09:08:15 -0700 |
parents | 3efdfd6ddbf2 |
children | 23123fc6968a |
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0 | 1 /* |
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2 * Copyright (c) 1998, 2013, 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 #ifndef SHARE_VM_OOPS_CPCACHEOOP_HPP |
26 #define SHARE_VM_OOPS_CPCACHEOOP_HPP | |
27 | |
28 #include "interpreter/bytecodes.hpp" | |
29 #include "memory/allocation.hpp" | |
30 #include "utilities/array.hpp" | |
31 | |
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32 class PSPromotionManager; |
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33 |
0 | 34 // A ConstantPoolCacheEntry describes an individual entry of the constant |
35 // pool cache. There's 2 principal kinds of entries: field entries for in- | |
36 // stance & static field access, and method entries for invokes. Some of | |
37 // the entry layout is shared and looks as follows: | |
38 // | |
39 // bit number |31 0| | |
40 // bit length |-8--|-8--|---16----| | |
41 // -------------------------------- | |
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42 // _indices [ b2 | b1 | index ] index = constant_pool_index |
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43 // _f1 [ entry specific ] metadata ptr (method or klass) |
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44 // _f2 [ entry specific ] vtable or res_ref index, or vfinal method ptr |
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45 // _flags [tos|0|F=1|0|0|0|f|v|0 |0000|field_index] (for field entries) |
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46 // bit length [ 4 |1| 1 |1|1|1|1|1|1 |-4--|----16-----] |
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47 // _flags [tos|0|F=0|M|A|I|f|0|vf|0000|00000|psize] (for method entries) |
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48 // bit length [ 4 |1| 1 |1|1|1|1|1|1 |-4--|--8--|--8--] |
0 | 49 |
50 // -------------------------------- | |
51 // | |
52 // with: | |
53 // index = original constant pool index | |
54 // b1 = bytecode 1 | |
55 // b2 = bytecode 2 | |
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56 // psize = parameters size (method entries only) |
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57 // field_index = index into field information in holder InstanceKlass |
0 | 58 // The index max is 0xffff (max number of fields in constant pool) |
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59 // and is multiplied by (InstanceKlass::next_offset) when accessing. |
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60 // tos = TosState |
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61 // F = the entry is for a field (or F=0 for a method) |
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62 // A = call site has an appendix argument (loaded from resolved references) |
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63 // I = interface call is forced virtual (must use a vtable index or vfinal) |
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64 // f = field or method is final |
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65 // v = field is volatile |
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66 // vf = virtual but final (method entries only: is_vfinal()) |
0 | 67 // |
68 // The flags after TosState have the following interpretation: | |
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69 // bit 27: 0 for fields, 1 for methods |
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70 // f flag true if field is marked final |
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71 // v flag true if field is volatile (only for fields) |
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72 // f2 flag true if f2 contains an oop (e.g., virtual final method) |
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73 // fv flag true if invokeinterface used for method in class Object |
0 | 74 // |
75 // The flags 31, 30, 29, 28 together build a 4 bit number 0 to 8 with the | |
76 // following mapping to the TosState states: | |
77 // | |
78 // btos: 0 | |
79 // ctos: 1 | |
80 // stos: 2 | |
81 // itos: 3 | |
82 // ltos: 4 | |
83 // ftos: 5 | |
84 // dtos: 6 | |
85 // atos: 7 | |
86 // vtos: 8 | |
87 // | |
88 // Entry specific: field entries: | |
89 // _indices = get (b1 section) and put (b2 section) bytecodes, original constant pool index | |
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90 // _f1 = field holder (as a java.lang.Class, not a Klass*) |
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91 // _f2 = field offset in bytes |
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92 // _flags = field type information, original FieldInfo index in field holder |
0 | 93 // (field_index section) |
94 // | |
95 // Entry specific: method entries: | |
96 // _indices = invoke code for f1 (b1 section), invoke code for f2 (b2 section), | |
97 // original constant pool index | |
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98 // _f1 = Method* for non-virtual calls, unused by virtual calls. |
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99 // for interface calls, which are essentially virtual but need a klass, |
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100 // contains Klass* for the corresponding interface. |
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101 // for invokedynamic, f1 contains a site-specific CallSite object (as an appendix) |
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102 // for invokehandle, f1 contains a site-specific MethodType object (as an appendix) |
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103 // (upcoming metadata changes will move the appendix to a separate array) |
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104 // _f2 = vtable/itable index (or final Method*) for virtual calls only, |
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105 // unused by non-virtual. The is_vfinal flag indicates this is a |
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106 // method pointer for a final method, not an index. |
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107 // _flags = method type info (t section), |
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108 // virtual final bit (vfinal), |
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109 // parameter size (psize section) |
0 | 110 // |
111 // Note: invokevirtual & invokespecial bytecodes can share the same constant | |
112 // pool entry and thus the same constant pool cache entry. All invoke | |
113 // bytecodes but invokevirtual use only _f1 and the corresponding b1 | |
114 // bytecode, while invokevirtual uses only _f2 and the corresponding | |
115 // b2 bytecode. The value of _flags is shared for both types of entries. | |
116 // | |
117 // The fields are volatile so that they are stored in the order written in the | |
118 // source code. The _indices field with the bytecode must be written last. | |
119 | |
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120 class CallInfo; |
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121 |
0 | 122 class ConstantPoolCacheEntry VALUE_OBJ_CLASS_SPEC { |
123 friend class VMStructs; | |
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124 friend class constantPoolCacheKlass; |
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125 friend class ConstantPool; |
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126 friend class InterpreterRuntime; |
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127 |
0 | 128 private: |
129 volatile intx _indices; // constant pool index & rewrite bytecodes | |
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130 volatile Metadata* _f1; // entry specific metadata field |
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131 volatile intx _f2; // entry specific int/metadata field |
0 | 132 volatile intx _flags; // flags |
133 | |
134 | |
135 void set_bytecode_1(Bytecodes::Code code); | |
136 void set_bytecode_2(Bytecodes::Code code); | |
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137 void set_f1(Metadata* f1) { |
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138 Metadata* existing_f1 = (Metadata*)_f1; // read once |
0 | 139 assert(existing_f1 == NULL || existing_f1 == f1, "illegal field change"); |
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140 _f1 = f1; |
0 | 141 } |
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142 void release_set_f1(Metadata* f1); |
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143 void set_f2(intx f2) { assert(_f2 == 0 || _f2 == f2, "illegal field change"); _f2 = f2; } |
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144 void set_f2_as_vfinal_method(Method* f2) { assert(_f2 == 0 || _f2 == (intptr_t) f2, "illegal field change"); assert(is_vfinal(), "flags must be set"); _f2 = (intptr_t) f2; } |
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145 int make_flags(TosState state, int option_bits, int field_index_or_method_params); |
0 | 146 void set_flags(intx flags) { _flags = flags; } |
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147 bool init_flags_atomic(intx flags); |
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148 void set_field_flags(TosState field_type, int option_bits, int field_index) { |
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149 assert((field_index & field_index_mask) == field_index, "field_index in range"); |
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150 set_flags(make_flags(field_type, option_bits | (1 << is_field_entry_shift), field_index)); |
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151 } |
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152 void set_method_flags(TosState return_type, int option_bits, int method_params) { |
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153 assert((method_params & parameter_size_mask) == method_params, "method_params in range"); |
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154 set_flags(make_flags(return_type, option_bits, method_params)); |
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155 } |
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156 bool init_method_flags_atomic(TosState return_type, int option_bits, int method_params) { |
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157 assert((method_params & parameter_size_mask) == method_params, "method_params in range"); |
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158 return init_flags_atomic(make_flags(return_type, option_bits, method_params)); |
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159 } |
0 | 160 |
161 public: | |
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162 // specific bit definitions for the flags field: |
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163 // (Note: the interpreter must use these definitions to access the CP cache.) |
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164 enum { |
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165 // high order bits are the TosState corresponding to field type or method return type |
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166 tos_state_bits = 4, |
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167 tos_state_mask = right_n_bits(tos_state_bits), |
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168 tos_state_shift = BitsPerInt - tos_state_bits, // see verify_tos_state_shift below |
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169 // misc. option bits; can be any bit position in [16..27] |
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170 is_field_entry_shift = 26, // (F) is it a field or a method? |
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171 has_method_type_shift = 25, // (M) does the call site have a MethodType? |
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172 has_appendix_shift = 24, // (A) does the call site have an appendix argument? |
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173 is_forced_virtual_shift = 23, // (I) is the interface reference forced to virtual mode? |
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174 is_final_shift = 22, // (f) is the field or method final? |
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175 is_volatile_shift = 21, // (v) is the field volatile? |
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176 is_vfinal_shift = 20, // (vf) did the call resolve to a final method? |
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177 // low order bits give field index (for FieldInfo) or method parameter size: |
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178 field_index_bits = 16, |
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179 field_index_mask = right_n_bits(field_index_bits), |
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180 parameter_size_bits = 8, // subset of field_index_mask, range is 0..255 |
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181 parameter_size_mask = right_n_bits(parameter_size_bits), |
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182 option_bits_mask = ~(((-1) << tos_state_shift) | (field_index_mask | parameter_size_mask)) |
0 | 183 }; |
184 | |
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185 // specific bit definitions for the indices field: |
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186 enum { |
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187 cp_index_bits = 2*BitsPerByte, |
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188 cp_index_mask = right_n_bits(cp_index_bits), |
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189 bytecode_1_shift = cp_index_bits, |
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190 bytecode_1_mask = right_n_bits(BitsPerByte), // == (u1)0xFF |
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191 bytecode_2_shift = cp_index_bits + BitsPerByte, |
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192 bytecode_2_mask = right_n_bits(BitsPerByte) // == (u1)0xFF |
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193 }; |
0 | 194 |
195 | |
196 // Initialization | |
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197 void initialize_entry(int original_index); // initialize primary entry |
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198 void initialize_resolved_reference_index(int ref_index) { |
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199 assert(_f2 == 0, "set once"); // note: ref_index might be zero also |
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200 _f2 = ref_index; |
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201 } |
0 | 202 |
203 void set_field( // sets entry to resolved field state | |
204 Bytecodes::Code get_code, // the bytecode used for reading the field | |
205 Bytecodes::Code put_code, // the bytecode used for writing the field | |
206 KlassHandle field_holder, // the object/klass holding the field | |
207 int orig_field_index, // the original field index in the field holder | |
208 int field_offset, // the field offset in words in the field holder | |
209 TosState field_type, // the (machine) field type | |
210 bool is_final, // the field is final | |
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211 bool is_volatile, // the field is volatile |
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212 Klass* root_klass // needed by the GC to dirty the klass |
0 | 213 ); |
214 | |
215 void set_method( // sets entry to resolved method entry | |
216 Bytecodes::Code invoke_code, // the bytecode used for invoking the method | |
217 methodHandle method, // the method/prototype if any (NULL, otherwise) | |
218 int vtable_index // the vtable index if any, else negative | |
219 ); | |
220 | |
221 void set_interface_call( | |
222 methodHandle method, // Resolved method | |
223 int index // Method index into interface | |
224 ); | |
225 | |
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226 void set_method_handle( |
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227 constantPoolHandle cpool, // holding constant pool (required for locking) |
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228 const CallInfo &call_info // Call link information |
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229 ); |
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230 |
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231 void set_dynamic_call( |
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232 constantPoolHandle cpool, // holding constant pool (required for locking) |
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233 const CallInfo &call_info // Call link information |
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234 ); |
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235 |
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236 // Common code for invokedynamic and MH invocations. |
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237 |
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238 // The "appendix" is an optional call-site-specific parameter which is |
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239 // pushed by the JVM at the end of the argument list. This argument may |
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240 // be a MethodType for the MH.invokes and a CallSite for an invokedynamic |
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241 // instruction. However, its exact type and use depends on the Java upcall, |
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242 // which simply returns a compiled LambdaForm along with any reference |
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243 // that LambdaForm needs to complete the call. If the upcall returns a |
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244 // null appendix, the argument is not passed at all. |
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245 // |
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246 // The appendix is *not* represented in the signature of the symbolic |
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247 // reference for the call site, but (if present) it *is* represented in |
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248 // the Method* bound to the site. This means that static and dynamic |
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249 // resolution logic needs to make slightly different assessments about the |
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250 // number and types of arguments. |
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251 void set_method_handle_common( |
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252 constantPoolHandle cpool, // holding constant pool (required for locking) |
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253 Bytecodes::Code invoke_code, // _invokehandle or _invokedynamic |
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254 const CallInfo &call_info // Call link information |
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255 ); |
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256 |
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257 // invokedynamic and invokehandle call sites have two entries in the |
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258 // resolved references array: |
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259 // appendix (at index+0) |
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260 // MethodType (at index+1) |
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261 enum { |
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262 _indy_resolved_references_appendix_offset = 0, |
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263 _indy_resolved_references_method_type_offset = 1, |
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264 _indy_resolved_references_entries |
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265 }; |
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266 |
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267 Method* method_if_resolved(constantPoolHandle cpool); |
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268 oop appendix_if_resolved(constantPoolHandle cpool); |
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269 oop method_type_if_resolved(constantPoolHandle cpool); |
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270 |
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271 void set_parameter_size(int value); |
0 | 272 |
273 // Which bytecode number (1 or 2) in the index field is valid for this bytecode? | |
274 // Returns -1 if neither is valid. | |
275 static int bytecode_number(Bytecodes::Code code) { | |
276 switch (code) { | |
277 case Bytecodes::_getstatic : // fall through | |
278 case Bytecodes::_getfield : // fall through | |
279 case Bytecodes::_invokespecial : // fall through | |
280 case Bytecodes::_invokestatic : // fall through | |
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281 case Bytecodes::_invokehandle : // fall through |
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282 case Bytecodes::_invokedynamic : // fall through |
0 | 283 case Bytecodes::_invokeinterface : return 1; |
284 case Bytecodes::_putstatic : // fall through | |
285 case Bytecodes::_putfield : // fall through | |
286 case Bytecodes::_invokevirtual : return 2; | |
287 default : break; | |
288 } | |
289 return -1; | |
290 } | |
291 | |
292 // Has this bytecode been resolved? Only valid for invokes and get/put field/static. | |
293 bool is_resolved(Bytecodes::Code code) const { | |
294 switch (bytecode_number(code)) { | |
295 case 1: return (bytecode_1() == code); | |
296 case 2: return (bytecode_2() == code); | |
297 } | |
298 return false; // default: not resolved | |
299 } | |
300 | |
301 // Accessors | |
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302 int indices() const { return _indices; } |
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303 int constant_pool_index() const { return (indices() & cp_index_mask); } |
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304 Bytecodes::Code bytecode_1() const { return Bytecodes::cast((indices() >> bytecode_1_shift) & bytecode_1_mask); } |
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305 Bytecodes::Code bytecode_2() const { return Bytecodes::cast((indices() >> bytecode_2_shift) & bytecode_2_mask); } |
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306 Method* f1_as_method() const { Metadata* f1 = (Metadata*)_f1; assert(f1 == NULL || f1->is_method(), ""); return (Method*)f1; } |
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307 Klass* f1_as_klass() const { Metadata* f1 = (Metadata*)_f1; assert(f1 == NULL || f1->is_klass(), ""); return (Klass*)f1; } |
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308 bool is_f1_null() const { Metadata* f1 = (Metadata*)_f1; return f1 == NULL; } // classifies a CPC entry as unbound |
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309 int f2_as_index() const { assert(!is_vfinal(), ""); return (int) _f2; } |
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310 Method* f2_as_vfinal_method() const { assert(is_vfinal(), ""); return (Method*)_f2; } |
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311 int field_index() const { assert(is_field_entry(), ""); return (_flags & field_index_mask); } |
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312 int parameter_size() const { assert(is_method_entry(), ""); return (_flags & parameter_size_mask); } |
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313 bool is_volatile() const { return (_flags & (1 << is_volatile_shift)) != 0; } |
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314 bool is_final() const { return (_flags & (1 << is_final_shift)) != 0; } |
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315 bool is_forced_virtual() const { return (_flags & (1 << is_forced_virtual_shift)) != 0; } |
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316 bool is_vfinal() const { return (_flags & (1 << is_vfinal_shift)) != 0; } |
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317 bool has_appendix() const { return (_flags & (1 << has_appendix_shift)) != 0; } |
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318 bool has_method_type() const { return (_flags & (1 << has_method_type_shift)) != 0; } |
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319 bool is_method_entry() const { return (_flags & (1 << is_field_entry_shift)) == 0; } |
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320 bool is_field_entry() const { return (_flags & (1 << is_field_entry_shift)) != 0; } |
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321 bool is_byte() const { return flag_state() == btos; } |
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322 bool is_char() const { return flag_state() == ctos; } |
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323 bool is_short() const { return flag_state() == stos; } |
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324 bool is_int() const { return flag_state() == itos; } |
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325 bool is_long() const { return flag_state() == ltos; } |
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326 bool is_float() const { return flag_state() == ftos; } |
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327 bool is_double() const { return flag_state() == dtos; } |
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328 bool is_object() const { return flag_state() == atos; } |
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329 TosState flag_state() const { assert((uint)number_of_states <= (uint)tos_state_mask+1, ""); |
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330 return (TosState)((_flags >> tos_state_shift) & tos_state_mask); } |
0 | 331 |
332 // Code generation support | |
333 static WordSize size() { return in_WordSize(sizeof(ConstantPoolCacheEntry) / HeapWordSize); } | |
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334 static ByteSize size_in_bytes() { return in_ByteSize(sizeof(ConstantPoolCacheEntry)); } |
0 | 335 static ByteSize indices_offset() { return byte_offset_of(ConstantPoolCacheEntry, _indices); } |
336 static ByteSize f1_offset() { return byte_offset_of(ConstantPoolCacheEntry, _f1); } | |
337 static ByteSize f2_offset() { return byte_offset_of(ConstantPoolCacheEntry, _f2); } | |
338 static ByteSize flags_offset() { return byte_offset_of(ConstantPoolCacheEntry, _flags); } | |
339 | |
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340 #if INCLUDE_JVMTI |
0 | 341 // RedefineClasses() API support: |
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342 // If this ConstantPoolCacheEntry refers to old_method then update it |
0 | 343 // to refer to new_method. |
344 // trace_name_printed is set to true if the current call has | |
345 // printed the klass name so that other routines in the adjust_* | |
346 // group don't print the klass name. | |
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347 bool adjust_method_entry(Method* old_method, Method* new_method, |
0 | 348 bool * trace_name_printed); |
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349 bool check_no_old_or_obsolete_entries(); |
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350 bool is_interesting_method_entry(Klass* k); |
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351 #endif // INCLUDE_JVMTI |
0 | 352 |
353 // Debugging & Printing | |
354 void print (outputStream* st, int index) const; | |
355 void verify(outputStream* st) const; | |
356 | |
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357 static void verify_tos_state_shift() { |
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358 // When shifting flags as a 32-bit int, make sure we don't need an extra mask for tos_state: |
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359 assert((((u4)-1 >> tos_state_shift) & ~tos_state_mask) == 0, "no need for tos_state mask"); |
0 | 360 } |
361 }; | |
362 | |
363 | |
364 // A constant pool cache is a runtime data structure set aside to a constant pool. The cache | |
365 // holds interpreter runtime information for all field access and invoke bytecodes. The cache | |
366 // is created and initialized before a class is actively used (i.e., initialized), the indivi- | |
367 // dual cache entries are filled at resolution (i.e., "link") time (see also: rewriter.*). | |
368 | |
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369 class ConstantPoolCache: public MetaspaceObj { |
0 | 370 friend class VMStructs; |
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371 friend class MetadataFactory; |
0 | 372 private: |
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373 int _length; |
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374 ConstantPool* _constant_pool; // the corresponding constant pool |
0 | 375 |
376 // Sizing | |
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377 debug_only(friend class ClassVerifier;) |
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378 |
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379 // Constructor |
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380 ConstantPoolCache(int length, const intStack& inverse_index_map, |
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381 const intStack& invokedynamic_references_map) : |
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382 _length(length), _constant_pool(NULL) { |
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383 initialize(inverse_index_map, invokedynamic_references_map); |
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384 for (int i = 0; i < length; i++) { |
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385 assert(entry_at(i)->is_f1_null(), "Failed to clear?"); |
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386 } |
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387 } |
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388 |
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389 // Initialization |
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390 void initialize(const intArray& inverse_index_map, const intArray& invokedynamic_references_map); |
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391 public: |
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392 static ConstantPoolCache* allocate(ClassLoaderData* loader_data, int length, |
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393 const intStack& inverse_index_map, |
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394 const intStack& invokedynamic_references_map, TRAPS); |
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395 bool is_constantPoolCache() const { return true; } |
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396 |
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397 int length() const { return _length; } |
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398 private: |
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399 void set_length(int length) { _length = length; } |
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400 |
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401 static int header_size() { return sizeof(ConstantPoolCache) / HeapWordSize; } |
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402 static int size(int length) { return align_object_size(header_size() + length * in_words(ConstantPoolCacheEntry::size())); } |
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403 public: |
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404 int size() const { return size(length()); } |
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405 private: |
0 | 406 |
407 // Helpers | |
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408 ConstantPool** constant_pool_addr() { return &_constant_pool; } |
0 | 409 ConstantPoolCacheEntry* base() const { return (ConstantPoolCacheEntry*)((address)this + in_bytes(base_offset())); } |
410 | |
411 friend class constantPoolCacheKlass; | |
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412 friend class ConstantPoolCacheEntry; |
0 | 413 |
414 public: | |
415 // Accessors | |
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416 void set_constant_pool(ConstantPool* pool) { _constant_pool = pool; } |
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417 ConstantPool* constant_pool() const { return _constant_pool; } |
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418 // Fetches the entry at the given index. |
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419 // In either case the index must not be encoded or byte-swapped in any way. |
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420 ConstantPoolCacheEntry* entry_at(int i) const { |
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421 assert(0 <= i && i < length(), "index out of bounds"); |
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422 return base() + i; |
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423 } |
0 | 424 |
425 // Code generation | |
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426 static ByteSize base_offset() { return in_ByteSize(sizeof(ConstantPoolCache)); } |
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427 static ByteSize entry_offset(int raw_index) { |
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428 int index = raw_index; |
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429 return (base_offset() + ConstantPoolCacheEntry::size_in_bytes() * index); |
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430 } |
0 | 431 |
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432 #if INCLUDE_JVMTI |
0 | 433 // RedefineClasses() API support: |
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434 // If any entry of this ConstantPoolCache points to any of |
0 | 435 // old_methods, replace it with the corresponding new_method. |
436 // trace_name_printed is set to true if the current call has | |
437 // printed the klass name so that other routines in the adjust_* | |
438 // group don't print the klass name. | |
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439 void adjust_method_entries(Method** old_methods, Method** new_methods, |
0 | 440 int methods_length, bool * trace_name_printed); |
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441 bool check_no_old_or_obsolete_entries(); |
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442 void dump_cache(); |
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443 #endif // INCLUDE_JVMTI |
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444 |
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445 // Deallocate - no fields to deallocate |
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446 DEBUG_ONLY(bool on_stack() { return false; }) |
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447 void deallocate_contents(ClassLoaderData* data) {} |
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448 bool is_klass() const { return false; } |
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449 |
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450 // Printing |
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451 void print_on(outputStream* st) const; |
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452 void print_value_on(outputStream* st) const; |
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453 |
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454 const char* internal_name() const { return "{constant pool cache}"; } |
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455 |
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456 // Verify |
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457 void verify_on(outputStream* st); |
0 | 458 }; |
1972 | 459 |
460 #endif // SHARE_VM_OOPS_CPCACHEOOP_HPP |