Mercurial > hg > graal-compiler
annotate src/share/vm/oops/constantPool.hpp @ 8124:5fc51c1ecdeb
Merge.
| author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
|---|---|
| date | Tue, 05 Mar 2013 23:44:54 +0100 |
| parents | 3ac7d10a6572 f16e75e0cf11 |
| children | 836a62f43af9 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 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_CONSTANTPOOLOOP_HPP |
| 26 #define SHARE_VM_OOPS_CONSTANTPOOLOOP_HPP | |
| 27 | |
| 28 #include "oops/arrayOop.hpp" | |
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29 #include "oops/cpCache.hpp" |
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30 #include "oops/objArrayOop.hpp" |
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31 #include "oops/symbol.hpp" |
| 1972 | 32 #include "oops/typeArrayOop.hpp" |
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33 #include "runtime/handles.hpp" |
| 1972 | 34 #include "utilities/constantTag.hpp" |
| 35 #ifdef TARGET_ARCH_x86 | |
| 36 # include "bytes_x86.hpp" | |
| 37 #endif | |
| 38 #ifdef TARGET_ARCH_sparc | |
| 39 # include "bytes_sparc.hpp" | |
| 40 #endif | |
| 41 #ifdef TARGET_ARCH_zero | |
| 42 # include "bytes_zero.hpp" | |
| 43 #endif | |
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44 #ifdef TARGET_ARCH_arm |
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45 # include "bytes_arm.hpp" |
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46 #endif |
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47 #ifdef TARGET_ARCH_ppc |
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48 # include "bytes_ppc.hpp" |
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49 #endif |
| 1972 | 50 |
| 0 | 51 // A constantPool is an array containing class constants as described in the |
| 52 // class file. | |
| 53 // | |
| 54 // Most of the constant pool entries are written during class parsing, which | |
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55 // is safe. For klass types, the constant pool entry is |
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56 // modified when the entry is resolved. If a klass constant pool |
| 0 | 57 // entry is read without a lock, only the resolved state guarantees that |
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58 // the entry in the constant pool is a klass object and not a Symbol*. |
| 0 | 59 |
| 60 class SymbolHashMap; | |
| 61 | |
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62 class CPSlot VALUE_OBJ_CLASS_SPEC { |
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63 intptr_t _ptr; |
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64 public: |
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65 CPSlot(intptr_t ptr): _ptr(ptr) {} |
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66 CPSlot(Klass* ptr): _ptr((intptr_t)ptr) {} |
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67 CPSlot(Symbol* ptr): _ptr((intptr_t)ptr | 1) {} |
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68 |
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69 intptr_t value() { return _ptr; } |
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70 bool is_resolved() { return (_ptr & 1) == 0; } |
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71 bool is_unresolved() { return (_ptr & 1) == 1; } |
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72 |
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73 Symbol* get_symbol() { |
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74 assert(is_unresolved(), "bad call"); |
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75 return (Symbol*)(_ptr & ~1); |
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76 } |
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77 Klass* get_klass() { |
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78 assert(is_resolved(), "bad call"); |
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79 return (Klass*)_ptr; |
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80 } |
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81 }; |
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82 |
| 7956 | 83 class KlassSizeStats; |
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84 class ConstantPool : public Metadata { |
| 0 | 85 friend class VMStructs; |
| 86 friend class BytecodeInterpreter; // Directly extracts an oop in the pool for fast instanceof/checkcast | |
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87 friend class Universe; // For null constructor |
| 0 | 88 private: |
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89 Array<u1>* _tags; // the tag array describing the constant pool's contents |
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90 ConstantPoolCache* _cache; // the cache holding interpreter runtime information |
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91 InstanceKlass* _pool_holder; // the corresponding class |
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92 Array<u2>* _operands; // for variable-sized (InvokeDynamic) nodes, usually empty |
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93 |
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94 // Array of resolved objects from the constant pool and map from resolved |
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95 // object index to original constant pool index |
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96 jobject _resolved_references; |
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97 Array<u2>* _reference_map; |
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98 |
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99 enum { |
| 8104 | 100 _has_preresolution = 1, // Flags |
| 101 _on_stack = 2 | |
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102 }; |
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103 |
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104 int _flags; // old fashioned bit twiddling |
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105 int _length; // number of elements in the array |
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106 |
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107 union { |
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108 // set for CDS to restore resolved references |
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109 int _resolved_reference_length; |
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110 // keeps version number for redefined classes (used in backtrace) |
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111 int _version; |
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112 } _saved; |
| 0 | 113 |
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114 Monitor* _lock; |
| 0 | 115 |
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116 void set_tags(Array<u1>* tags) { _tags = tags; } |
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117 void tag_at_put(int which, jbyte t) { tags()->at_put(which, t); } |
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118 void release_tag_at_put(int which, jbyte t) { tags()->release_at_put(which, t); } |
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119 |
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120 void set_operands(Array<u2>* operands) { _operands = operands; } |
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121 |
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122 int flags() const { return _flags; } |
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123 void set_flags(int f) { _flags = f; } |
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124 |
| 0 | 125 private: |
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126 intptr_t* base() const { return (intptr_t*) (((char*) this) + sizeof(ConstantPool)); } |
| 0 | 127 |
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128 CPSlot slot_at(int which) { |
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129 assert(is_within_bounds(which), "index out of bounds"); |
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130 // Uses volatile because the klass slot changes without a lock. |
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131 volatile intptr_t adr = (intptr_t)OrderAccess::load_ptr_acquire(obj_at_addr_raw(which)); |
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132 assert(adr != 0 || which == 0, "cp entry for klass should not be zero"); |
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133 return CPSlot(adr); |
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134 } |
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135 |
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136 void slot_at_put(int which, CPSlot s) const { |
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137 assert(is_within_bounds(which), "index out of bounds"); |
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138 assert(s.value() != 0, "Caught something"); |
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139 *(intptr_t*)&base()[which] = s.value(); |
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140 } |
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141 intptr_t* obj_at_addr_raw(int which) const { |
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142 assert(is_within_bounds(which), "index out of bounds"); |
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143 return (intptr_t*) &base()[which]; |
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144 } |
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145 |
| 0 | 146 jint* int_at_addr(int which) const { |
| 147 assert(is_within_bounds(which), "index out of bounds"); | |
| 148 return (jint*) &base()[which]; | |
| 149 } | |
| 150 | |
| 151 jlong* long_at_addr(int which) const { | |
| 152 assert(is_within_bounds(which), "index out of bounds"); | |
| 153 return (jlong*) &base()[which]; | |
| 154 } | |
| 155 | |
| 156 jfloat* float_at_addr(int which) const { | |
| 157 assert(is_within_bounds(which), "index out of bounds"); | |
| 158 return (jfloat*) &base()[which]; | |
| 159 } | |
| 160 | |
| 161 jdouble* double_at_addr(int which) const { | |
| 162 assert(is_within_bounds(which), "index out of bounds"); | |
| 163 return (jdouble*) &base()[which]; | |
| 164 } | |
| 165 | |
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166 ConstantPool(Array<u1>* tags); |
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167 ConstantPool() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } |
| 0 | 168 public: |
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169 static ConstantPool* allocate(ClassLoaderData* loader_data, int length, TRAPS); |
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170 |
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171 bool is_constantPool() const volatile { return true; } |
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172 |
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173 Array<u1>* tags() const { return _tags; } |
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174 Array<u2>* operands() const { return _operands; } |
| 0 | 175 |
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176 bool has_preresolution() const { return (_flags & _has_preresolution) != 0; } |
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177 void set_has_preresolution() { _flags |= _has_preresolution; } |
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178 |
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179 // Redefine classes support. If a method refering to this constant pool |
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180 // is on the executing stack, or as a handle in vm code, this constant pool |
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181 // can't be removed from the set of previous versions saved in the instance |
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182 // class. |
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183 bool on_stack() const { return (_flags &_on_stack) != 0; } |
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184 void set_on_stack(const bool value); |
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185 |
| 0 | 186 // Klass holding pool |
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187 InstanceKlass* pool_holder() const { return _pool_holder; } |
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188 void set_pool_holder(InstanceKlass* k) { _pool_holder = k; } |
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189 InstanceKlass** pool_holder_addr() { return &_pool_holder; } |
| 0 | 190 |
| 191 // Interpreter runtime support | |
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192 ConstantPoolCache* cache() const { return _cache; } |
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193 void set_cache(ConstantPoolCache* cache){ _cache = cache; } |
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194 |
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195 // Create object cache in the constant pool |
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196 void initialize_resolved_references(ClassLoaderData* loader_data, |
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197 intStack reference_map, |
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198 int constant_pool_map_length, |
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199 TRAPS); |
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200 |
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201 // resolved strings, methodHandles and callsite objects from the constant pool |
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202 objArrayOop resolved_references() const; |
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203 // mapping resolved object array indexes to cp indexes and back. |
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204 int object_to_cp_index(int index) { return _reference_map->at(index); } |
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205 int cp_to_object_index(int index); |
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206 |
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207 // Invokedynamic indexes. |
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208 // They must look completely different from normal indexes. |
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209 // The main reason is that byte swapping is sometimes done on normal indexes. |
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210 // Finally, it is helpful for debugging to tell the two apart. |
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211 static bool is_invokedynamic_index(int i) { return (i < 0); } |
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212 static int decode_invokedynamic_index(int i) { assert(is_invokedynamic_index(i), ""); return ~i; } |
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213 static int encode_invokedynamic_index(int i) { assert(!is_invokedynamic_index(i), ""); return ~i; } |
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214 |
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215 |
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216 // The invokedynamic points at a CP cache entry. This entry points back |
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217 // at the original CP entry (CONSTANT_InvokeDynamic) and also (via f2) at an entry |
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218 // in the resolved_references array (which provides the appendix argument). |
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219 int invokedynamic_cp_cache_index(int index) const { |
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220 assert (is_invokedynamic_index(index), "should be a invokedynamic index"); |
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221 int cache_index = decode_invokedynamic_index(index); |
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222 return cache_index; |
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223 } |
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224 ConstantPoolCacheEntry* invokedynamic_cp_cache_entry_at(int index) const { |
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225 // decode index that invokedynamic points to. |
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226 int cp_cache_index = invokedynamic_cp_cache_index(index); |
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227 return cache()->entry_at(cp_cache_index); |
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228 } |
| 0 | 229 |
| 230 // Assembly code support | |
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231 static int tags_offset_in_bytes() { return offset_of(ConstantPool, _tags); } |
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232 static int cache_offset_in_bytes() { return offset_of(ConstantPool, _cache); } |
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233 static int pool_holder_offset_in_bytes() { return offset_of(ConstantPool, _pool_holder); } |
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234 static int resolved_references_offset_in_bytes() { return offset_of(ConstantPool, _resolved_references); } |
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235 static int reference_map_offset_in_bytes() { return offset_of(ConstantPool, _reference_map); } |
| 0 | 236 |
| 237 // Storing constants | |
| 238 | |
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239 void klass_at_put(int which, Klass* k) { |
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240 assert(k != NULL, "resolved class shouldn't be null"); |
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241 assert(is_within_bounds(which), "index out of bounds"); |
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242 OrderAccess::release_store_ptr((Klass* volatile *)obj_at_addr_raw(which), k); |
| 0 | 243 // The interpreter assumes when the tag is stored, the klass is resolved |
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244 // and the Klass* is a klass rather than a Symbol*, so we need |
| 0 | 245 // hardware store ordering here. |
| 246 release_tag_at_put(which, JVM_CONSTANT_Class); | |
| 247 } | |
| 248 | |
| 249 // For temporary use while constructing constant pool | |
| 250 void klass_index_at_put(int which, int name_index) { | |
| 251 tag_at_put(which, JVM_CONSTANT_ClassIndex); | |
| 252 *int_at_addr(which) = name_index; | |
| 253 } | |
| 254 | |
| 255 // Temporary until actual use | |
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256 void unresolved_klass_at_put(int which, Symbol* s) { |
| 0 | 257 release_tag_at_put(which, JVM_CONSTANT_UnresolvedClass); |
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258 slot_at_put(which, s); |
| 0 | 259 } |
| 260 | |
| 1602 | 261 void method_handle_index_at_put(int which, int ref_kind, int ref_index) { |
| 262 tag_at_put(which, JVM_CONSTANT_MethodHandle); | |
| 263 *int_at_addr(which) = ((jint) ref_index<<16) | ref_kind; | |
| 264 } | |
| 265 | |
| 266 void method_type_index_at_put(int which, int ref_index) { | |
| 267 tag_at_put(which, JVM_CONSTANT_MethodType); | |
| 268 *int_at_addr(which) = ref_index; | |
| 269 } | |
| 270 | |
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271 void invoke_dynamic_at_put(int which, int bootstrap_specifier_index, int name_and_type_index) { |
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272 tag_at_put(which, JVM_CONSTANT_InvokeDynamic); |
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273 *int_at_addr(which) = ((jint) name_and_type_index<<16) | bootstrap_specifier_index; |
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274 } |
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275 |
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276 void unresolved_string_at_put(int which, Symbol* s) { |
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277 release_tag_at_put(which, JVM_CONSTANT_String); |
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278 *symbol_at_addr(which) = s; |
| 0 | 279 } |
| 280 | |
| 281 void int_at_put(int which, jint i) { | |
| 282 tag_at_put(which, JVM_CONSTANT_Integer); | |
| 283 *int_at_addr(which) = i; | |
| 284 } | |
| 285 | |
| 286 void long_at_put(int which, jlong l) { | |
| 287 tag_at_put(which, JVM_CONSTANT_Long); | |
| 288 // *long_at_addr(which) = l; | |
| 289 Bytes::put_native_u8((address)long_at_addr(which), *((u8*) &l)); | |
| 290 } | |
| 291 | |
| 292 void float_at_put(int which, jfloat f) { | |
| 293 tag_at_put(which, JVM_CONSTANT_Float); | |
| 294 *float_at_addr(which) = f; | |
| 295 } | |
| 296 | |
| 297 void double_at_put(int which, jdouble d) { | |
| 298 tag_at_put(which, JVM_CONSTANT_Double); | |
| 299 // *double_at_addr(which) = d; | |
| 300 // u8 temp = *(u8*) &d; | |
| 301 Bytes::put_native_u8((address) double_at_addr(which), *((u8*) &d)); | |
| 302 } | |
| 303 | |
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304 Symbol** symbol_at_addr(int which) const { |
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305 assert(is_within_bounds(which), "index out of bounds"); |
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306 return (Symbol**) &base()[which]; |
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307 } |
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308 |
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309 void symbol_at_put(int which, Symbol* s) { |
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310 assert(s->refcount() != 0, "should have nonzero refcount"); |
| 0 | 311 tag_at_put(which, JVM_CONSTANT_Utf8); |
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312 *symbol_at_addr(which) = s; |
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313 } |
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314 |
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315 void string_at_put(int which, int obj_index, oop str) { |
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316 resolved_references()->obj_at_put(obj_index, str); |
| 0 | 317 } |
| 318 | |
| 319 // For temporary use while constructing constant pool | |
| 320 void string_index_at_put(int which, int string_index) { | |
| 321 tag_at_put(which, JVM_CONSTANT_StringIndex); | |
| 322 *int_at_addr(which) = string_index; | |
| 323 } | |
| 324 | |
| 325 void field_at_put(int which, int class_index, int name_and_type_index) { | |
| 326 tag_at_put(which, JVM_CONSTANT_Fieldref); | |
| 327 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; | |
| 328 } | |
| 329 | |
| 330 void method_at_put(int which, int class_index, int name_and_type_index) { | |
| 331 tag_at_put(which, JVM_CONSTANT_Methodref); | |
| 332 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; | |
| 333 } | |
| 334 | |
| 335 void interface_method_at_put(int which, int class_index, int name_and_type_index) { | |
| 336 tag_at_put(which, JVM_CONSTANT_InterfaceMethodref); | |
| 337 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; // Not so nice | |
| 338 } | |
| 339 | |
| 340 void name_and_type_at_put(int which, int name_index, int signature_index) { | |
| 341 tag_at_put(which, JVM_CONSTANT_NameAndType); | |
| 342 *int_at_addr(which) = ((jint) signature_index<<16) | name_index; // Not so nice | |
| 343 } | |
| 344 | |
| 345 // Tag query | |
| 346 | |
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347 constantTag tag_at(int which) const { return (constantTag)tags()->at_acquire(which); } |
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348 |
| 0 | 349 // Fetching constants |
| 350 | |
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351 Klass* klass_at(int which, TRAPS) { |
| 0 | 352 constantPoolHandle h_this(THREAD, this); |
| 353 return klass_at_impl(h_this, which, CHECK_NULL); | |
| 354 } | |
| 355 | |
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356 Symbol* klass_name_at(int which); // Returns the name, w/o resolving. |
| 0 | 357 |
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358 Klass* resolved_klass_at(int which) { // Used by Compiler |
| 0 | 359 guarantee(tag_at(which).is_klass(), "Corrupted constant pool"); |
| 360 // Must do an acquire here in case another thread resolved the klass | |
| 361 // behind our back, lest we later load stale values thru the oop. | |
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362 return CPSlot((Klass*)OrderAccess::load_ptr_acquire(obj_at_addr_raw(which))).get_klass(); |
| 0 | 363 } |
| 364 | |
| 365 // This method should only be used with a cpool lock or during parsing or gc | |
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366 Symbol* unresolved_klass_at(int which) { // Temporary until actual use |
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367 Symbol* s = CPSlot((Symbol*)OrderAccess::load_ptr_acquire(obj_at_addr_raw(which))).get_symbol(); |
| 0 | 368 // check that the klass is still unresolved. |
| 369 assert(tag_at(which).is_unresolved_klass(), "Corrupted constant pool"); | |
| 370 return s; | |
| 371 } | |
| 372 | |
| 373 // RedefineClasses() API support: | |
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374 Symbol* klass_at_noresolve(int which) { return klass_name_at(which); } |
| 0 | 375 |
| 376 jint int_at(int which) { | |
| 377 assert(tag_at(which).is_int(), "Corrupted constant pool"); | |
| 378 return *int_at_addr(which); | |
| 379 } | |
| 380 | |
| 381 jlong long_at(int which) { | |
| 382 assert(tag_at(which).is_long(), "Corrupted constant pool"); | |
| 383 // return *long_at_addr(which); | |
| 384 u8 tmp = Bytes::get_native_u8((address)&base()[which]); | |
| 385 return *((jlong*)&tmp); | |
| 386 } | |
| 387 | |
| 388 jfloat float_at(int which) { | |
| 389 assert(tag_at(which).is_float(), "Corrupted constant pool"); | |
| 390 return *float_at_addr(which); | |
| 391 } | |
| 392 | |
| 393 jdouble double_at(int which) { | |
| 394 assert(tag_at(which).is_double(), "Corrupted constant pool"); | |
| 395 u8 tmp = Bytes::get_native_u8((address)&base()[which]); | |
| 396 return *((jdouble*)&tmp); | |
| 397 } | |
| 398 | |
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399 Symbol* symbol_at(int which) { |
| 0 | 400 assert(tag_at(which).is_utf8(), "Corrupted constant pool"); |
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401 return *symbol_at_addr(which); |
| 0 | 402 } |
| 403 | |
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404 oop string_at(int which, int obj_index, TRAPS) { |
| 0 | 405 constantPoolHandle h_this(THREAD, this); |
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406 return string_at_impl(h_this, which, obj_index, THREAD); |
| 0 | 407 } |
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408 oop string_at(int which, TRAPS) { |
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409 int obj_index = cp_to_object_index(which); |
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410 return string_at(which, obj_index, THREAD); |
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411 } |
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412 |
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413 // Version that can be used before string oop array is created. |
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414 oop uncached_string_at(int which, TRAPS); |
| 0 | 415 |
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416 // A "pseudo-string" is an non-string oop that has found is way into |
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417 // a String entry. |
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418 // Under EnableInvokeDynamic this can happen if the user patches a live |
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419 // object into a CONSTANT_String entry of an anonymous class. |
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420 // Method oops internally created for method handles may also |
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421 // use pseudo-strings to link themselves to related metaobjects. |
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422 |
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423 bool is_pseudo_string_at(int which) { |
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424 // A pseudo string is a string that doesn't have a symbol in the cpSlot |
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425 return unresolved_string_at(which) == NULL; |
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426 } |
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427 |
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428 oop pseudo_string_at(int which, int obj_index) { |
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429 assert(tag_at(which).is_string(), "Corrupted constant pool"); |
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430 assert(unresolved_string_at(which) == NULL, "shouldn't have symbol"); |
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431 oop s = resolved_references()->obj_at(obj_index); |
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432 return s; |
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433 } |
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434 |
| 8104 | 435 oop pseudo_string_at(int which) { |
| 436 assert(tag_at(which).is_string(), "Corrupted constant pool"); | |
| 437 assert(unresolved_string_at(which) == NULL, "shouldn't have symbol"); | |
| 438 int obj_index = cp_to_object_index(which); | |
| 439 oop s = resolved_references()->obj_at(obj_index); | |
| 440 return s; | |
| 441 } | |
| 442 | |
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443 void pseudo_string_at_put(int which, int obj_index, oop x) { |
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444 assert(EnableInvokeDynamic, ""); |
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445 assert(tag_at(which).is_string(), "Corrupted constant pool"); |
| 8104 | 446 unresolved_string_at_put(which, NULL); // indicates patched string |
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447 string_at_put(which, obj_index, x); // this works just fine |
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448 } |
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449 |
| 0 | 450 // only called when we are sure a string entry is already resolved (via an |
| 451 // earlier string_at call. | |
| 452 oop resolved_string_at(int which) { | |
| 453 assert(tag_at(which).is_string(), "Corrupted constant pool"); | |
| 454 // Must do an acquire here in case another thread resolved the klass | |
| 455 // behind our back, lest we later load stale values thru the oop. | |
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456 // we might want a volatile_obj_at in ObjArrayKlass. |
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457 int obj_index = cp_to_object_index(which); |
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458 return resolved_references()->obj_at(obj_index); |
| 0 | 459 } |
| 460 | |
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461 Symbol* unresolved_string_at(int which) { |
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462 assert(tag_at(which).is_string(), "Corrupted constant pool"); |
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463 Symbol* s = *symbol_at_addr(which); |
| 0 | 464 return s; |
| 465 } | |
| 466 | |
| 467 // Returns an UTF8 for a CONSTANT_String entry at a given index. | |
| 468 // UTF8 char* representation was chosen to avoid conversion of | |
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469 // java_lang_Strings at resolved entries into Symbol*s |
| 0 | 470 // or vice versa. |
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471 // Caller is responsible for checking for pseudo-strings. |
| 0 | 472 char* string_at_noresolve(int which); |
| 473 | |
| 474 jint name_and_type_at(int which) { | |
| 475 assert(tag_at(which).is_name_and_type(), "Corrupted constant pool"); | |
| 476 return *int_at_addr(which); | |
| 477 } | |
| 478 | |
| 1602 | 479 int method_handle_ref_kind_at(int which) { |
| 480 assert(tag_at(which).is_method_handle(), "Corrupted constant pool"); | |
| 481 return extract_low_short_from_int(*int_at_addr(which)); // mask out unwanted ref_index bits | |
| 482 } | |
| 483 int method_handle_index_at(int which) { | |
| 484 assert(tag_at(which).is_method_handle(), "Corrupted constant pool"); | |
| 485 return extract_high_short_from_int(*int_at_addr(which)); // shift out unwanted ref_kind bits | |
| 486 } | |
| 487 int method_type_index_at(int which) { | |
| 488 assert(tag_at(which).is_method_type(), "Corrupted constant pool"); | |
| 489 return *int_at_addr(which); | |
| 490 } | |
| 491 // Derived queries: | |
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492 Symbol* method_handle_name_ref_at(int which) { |
| 1602 | 493 int member = method_handle_index_at(which); |
| 494 return impl_name_ref_at(member, true); | |
| 495 } | |
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496 Symbol* method_handle_signature_ref_at(int which) { |
| 1602 | 497 int member = method_handle_index_at(which); |
| 498 return impl_signature_ref_at(member, true); | |
| 499 } | |
| 500 int method_handle_klass_index_at(int which) { | |
| 501 int member = method_handle_index_at(which); | |
| 502 return impl_klass_ref_index_at(member, true); | |
| 503 } | |
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504 Symbol* method_type_signature_at(int which) { |
| 1602 | 505 int sym = method_type_index_at(which); |
| 506 return symbol_at(sym); | |
| 507 } | |
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508 |
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509 int invoke_dynamic_name_and_type_ref_index_at(int which) { |
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510 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool"); |
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511 return extract_high_short_from_int(*int_at_addr(which)); |
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512 } |
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513 int invoke_dynamic_bootstrap_specifier_index(int which) { |
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514 assert(tag_at(which).value() == JVM_CONSTANT_InvokeDynamic, "Corrupted constant pool"); |
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515 return extract_low_short_from_int(*int_at_addr(which)); |
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516 } |
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517 int invoke_dynamic_operand_base(int which) { |
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518 int bootstrap_specifier_index = invoke_dynamic_bootstrap_specifier_index(which); |
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519 return operand_offset_at(operands(), bootstrap_specifier_index); |
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520 } |
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521 // The first part of the operands array consists of an index into the second part. |
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522 // Extract a 32-bit index value from the first part. |
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523 static int operand_offset_at(Array<u2>* operands, int bootstrap_specifier_index) { |
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524 int n = (bootstrap_specifier_index * 2); |
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525 assert(n >= 0 && n+2 <= operands->length(), "oob"); |
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526 // The first 32-bit index points to the beginning of the second part |
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527 // of the operands array. Make sure this index is in the first part. |
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528 DEBUG_ONLY(int second_part = build_int_from_shorts(operands->at(0), |
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529 operands->at(1))); |
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530 assert(second_part == 0 || n+2 <= second_part, "oob (2)"); |
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531 int offset = build_int_from_shorts(operands->at(n+0), |
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532 operands->at(n+1)); |
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533 // The offset itself must point into the second part of the array. |
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534 assert(offset == 0 || offset >= second_part && offset <= operands->length(), "oob (3)"); |
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535 return offset; |
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536 } |
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537 static void operand_offset_at_put(Array<u2>* operands, int bootstrap_specifier_index, int offset) { |
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538 int n = bootstrap_specifier_index * 2; |
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539 assert(n >= 0 && n+2 <= operands->length(), "oob"); |
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540 operands->at_put(n+0, extract_low_short_from_int(offset)); |
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541 operands->at_put(n+1, extract_high_short_from_int(offset)); |
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542 } |
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543 static int operand_array_length(Array<u2>* operands) { |
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544 if (operands == NULL || operands->length() == 0) return 0; |
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545 int second_part = operand_offset_at(operands, 0); |
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546 return (second_part / 2); |
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547 } |
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548 |
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549 #ifdef ASSERT |
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550 // operand tuples fit together exactly, end to end |
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551 static int operand_limit_at(Array<u2>* operands, int bootstrap_specifier_index) { |
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552 int nextidx = bootstrap_specifier_index + 1; |
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553 if (nextidx == operand_array_length(operands)) |
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554 return operands->length(); |
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555 else |
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556 return operand_offset_at(operands, nextidx); |
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557 } |
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558 int invoke_dynamic_operand_limit(int which) { |
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559 int bootstrap_specifier_index = invoke_dynamic_bootstrap_specifier_index(which); |
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560 return operand_limit_at(operands(), bootstrap_specifier_index); |
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561 } |
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562 #endif //ASSERT |
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563 |
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564 // layout of InvokeDynamic bootstrap method specifier (in second part of operands array): |
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565 enum { |
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566 _indy_bsm_offset = 0, // CONSTANT_MethodHandle bsm |
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567 _indy_argc_offset = 1, // u2 argc |
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568 _indy_argv_offset = 2 // u2 argv[argc] |
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569 }; |
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570 int invoke_dynamic_bootstrap_method_ref_index_at(int which) { |
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571 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool"); |
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572 int op_base = invoke_dynamic_operand_base(which); |
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573 return operands()->at(op_base + _indy_bsm_offset); |
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574 } |
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575 int invoke_dynamic_argument_count_at(int which) { |
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576 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool"); |
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577 int op_base = invoke_dynamic_operand_base(which); |
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578 int argc = operands()->at(op_base + _indy_argc_offset); |
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579 DEBUG_ONLY(int end_offset = op_base + _indy_argv_offset + argc; |
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580 int next_offset = invoke_dynamic_operand_limit(which)); |
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581 assert(end_offset == next_offset, "matched ending"); |
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582 return argc; |
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583 } |
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584 int invoke_dynamic_argument_index_at(int which, int j) { |
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585 int op_base = invoke_dynamic_operand_base(which); |
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586 DEBUG_ONLY(int argc = operands()->at(op_base + _indy_argc_offset)); |
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587 assert((uint)j < (uint)argc, "oob"); |
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588 return operands()->at(op_base + _indy_argv_offset + j); |
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589 } |
| 1602 | 590 |
|
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591 // The following methods (name/signature/klass_ref_at, klass_ref_at_noresolve, |
|
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592 // name_and_type_ref_index_at) all expect to be passed indices obtained |
|
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593 // directly from the bytecode. |
|
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594 // If the indices are meant to refer to fields or methods, they are |
|
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595 // actually rewritten constant pool cache indices. |
|
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596 // The routine remap_instruction_operand_from_cache manages the adjustment |
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597 // of these values back to constant pool indices. |
|
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598 |
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599 // There are also "uncached" versions which do not adjust the operand index; see below. |
| 0 | 600 |
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601 // FIXME: Consider renaming these with a prefix "cached_" to make the distinction clear. |
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602 // In a few cases (the verifier) there are uses before a cpcache has been built, |
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603 // which are handled by a dynamic check in remap_instruction_operand_from_cache. |
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604 // FIXME: Remove the dynamic check, and adjust all callers to specify the correct mode. |
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605 |
| 0 | 606 // Lookup for entries consisting of (klass_index, name_and_type index) |
|
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607 Klass* klass_ref_at(int which, TRAPS); |
|
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608 Symbol* klass_ref_at_noresolve(int which); |
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609 Symbol* name_ref_at(int which) { return impl_name_ref_at(which, false); } |
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610 Symbol* signature_ref_at(int which) { return impl_signature_ref_at(which, false); } |
| 0 | 611 |
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612 int klass_ref_index_at(int which) { return impl_klass_ref_index_at(which, false); } |
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613 int name_and_type_ref_index_at(int which) { return impl_name_and_type_ref_index_at(which, false); } |
| 0 | 614 |
| 615 // Lookup for entries consisting of (name_index, signature_index) | |
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616 int name_ref_index_at(int which_nt); // == low-order jshort of name_and_type_at(which_nt) |
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617 int signature_ref_index_at(int which_nt); // == high-order jshort of name_and_type_at(which_nt) |
| 0 | 618 |
| 619 BasicType basic_type_for_signature_at(int which); | |
| 620 | |
| 621 // Resolve string constants (to prevent allocation during compilation) | |
| 622 void resolve_string_constants(TRAPS) { | |
| 623 constantPoolHandle h_this(THREAD, this); | |
| 624 resolve_string_constants_impl(h_this, CHECK); | |
| 625 } | |
| 626 | |
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627 // CDS support |
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628 void remove_unshareable_info(); |
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629 void restore_unshareable_info(TRAPS); |
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630 bool resolve_class_constants(TRAPS); |
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631 // The ConstantPool vtable is restored by this call when the ConstantPool is |
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632 // in the shared archive. See patch_klass_vtables() in metaspaceShared.cpp for |
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633 // all the gory details. SA, dtrace and pstack helpers distinguish metadata |
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634 // by their vtable. |
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635 void restore_vtable() { guarantee(is_constantPool(), "vtable restored by this call"); } |
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636 |
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637 private: |
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638 enum { _no_index_sentinel = -1, _possible_index_sentinel = -2 }; |
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639 public: |
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640 |
| 1602 | 641 // Resolve late bound constants. |
| 642 oop resolve_constant_at(int index, TRAPS) { | |
| 643 constantPoolHandle h_this(THREAD, this); | |
|
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644 return resolve_constant_at_impl(h_this, index, _no_index_sentinel, THREAD); |
| 1602 | 645 } |
| 646 | |
| 647 oop resolve_cached_constant_at(int cache_index, TRAPS) { | |
| 648 constantPoolHandle h_this(THREAD, this); | |
|
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649 return resolve_constant_at_impl(h_this, _no_index_sentinel, cache_index, THREAD); |
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650 } |
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651 |
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652 oop resolve_possibly_cached_constant_at(int pool_index, TRAPS) { |
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653 constantPoolHandle h_this(THREAD, this); |
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654 return resolve_constant_at_impl(h_this, pool_index, _possible_index_sentinel, THREAD); |
| 1602 | 655 } |
| 656 | |
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657 oop resolve_bootstrap_specifier_at(int index, TRAPS) { |
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658 constantPoolHandle h_this(THREAD, this); |
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659 return resolve_bootstrap_specifier_at_impl(h_this, index, THREAD); |
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660 } |
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661 |
| 0 | 662 // Klass name matches name at offset |
| 663 bool klass_name_at_matches(instanceKlassHandle k, int which); | |
| 664 | |
| 665 // Sizing | |
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666 int length() const { return _length; } |
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667 void set_length(int length) { _length = length; } |
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668 |
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669 // Tells whether index is within bounds. |
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670 bool is_within_bounds(int index) const { |
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671 return 0 <= index && index < length(); |
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672 } |
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673 |
| 7956 | 674 // Sizing (in words) |
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675 static int header_size() { return sizeof(ConstantPool)/HeapWordSize; } |
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676 static int size(int length) { return align_object_size(header_size() + length); } |
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677 int size() const { return size(length()); } |
| 7956 | 678 #if INCLUDE_SERVICES |
| 679 void collect_statistics(KlassSizeStats *sz) const; | |
| 680 #endif | |
| 0 | 681 |
| 682 friend class ClassFileParser; | |
| 683 friend class SystemDictionary; | |
| 684 | |
| 685 // Used by compiler to prevent classloading. | |
|
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686 static Method* method_at_if_loaded (constantPoolHandle this_oop, int which); |
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687 static bool has_appendix_at_if_loaded (constantPoolHandle this_oop, int which); |
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688 static oop appendix_at_if_loaded (constantPoolHandle this_oop, int which); |
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689 static bool has_method_type_at_if_loaded (constantPoolHandle this_oop, int which); |
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690 static oop method_type_at_if_loaded (constantPoolHandle this_oop, int which); |
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691 static Klass* klass_at_if_loaded (constantPoolHandle this_oop, int which); |
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692 static Klass* klass_ref_at_if_loaded (constantPoolHandle this_oop, int which); |
| 0 | 693 // Same as above - but does LinkResolving. |
|
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694 static Klass* klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int which, TRAPS); |
| 0 | 695 |
| 696 // Routines currently used for annotations (only called by jvm.cpp) but which might be used in the | |
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697 // future by other Java code. These take constant pool indices rather than |
| 0 | 698 // constant pool cache indices as do the peer methods above. |
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699 Symbol* uncached_klass_ref_at_noresolve(int which); |
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700 Symbol* uncached_name_ref_at(int which) { return impl_name_ref_at(which, true); } |
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701 Symbol* uncached_signature_ref_at(int which) { return impl_signature_ref_at(which, true); } |
|
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702 int uncached_klass_ref_index_at(int which) { return impl_klass_ref_index_at(which, true); } |
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703 int uncached_name_and_type_ref_index_at(int which) { return impl_name_and_type_ref_index_at(which, true); } |
| 0 | 704 |
| 705 // Sharing | |
| 706 int pre_resolve_shared_klasses(TRAPS); | |
| 707 | |
| 708 // Debugging | |
| 709 const char* printable_name_at(int which) PRODUCT_RETURN0; | |
| 710 | |
| 1565 | 711 #ifdef ASSERT |
| 712 enum { CPCACHE_INDEX_TAG = 0x10000 }; // helps keep CP cache indices distinct from CP indices | |
| 1602 | 713 #else |
| 714 enum { CPCACHE_INDEX_TAG = 0 }; // in product mode, this zero value is a no-op | |
| 1565 | 715 #endif //ASSERT |
| 716 | |
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717 static int decode_cpcache_index(int raw_index, bool invokedynamic_ok = false) { |
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718 if (invokedynamic_ok && is_invokedynamic_index(raw_index)) |
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719 return decode_invokedynamic_index(raw_index); |
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720 else |
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721 return raw_index - CPCACHE_INDEX_TAG; |
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722 } |
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723 |
| 0 | 724 private: |
| 725 | |
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726 void set_resolved_references(jobject s) { _resolved_references = s; } |
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727 Array<u2>* reference_map() const { return _reference_map; } |
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728 void set_reference_map(Array<u2>* o) { _reference_map = o; } |
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729 |
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730 // patch JSR 292 resolved references after the class is linked. |
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731 void patch_resolved_references(GrowableArray<Handle>* cp_patches); |
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732 |
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733 Symbol* impl_name_ref_at(int which, bool uncached); |
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734 Symbol* impl_signature_ref_at(int which, bool uncached); |
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735 int impl_klass_ref_index_at(int which, bool uncached); |
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736 int impl_name_and_type_ref_index_at(int which, bool uncached); |
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737 |
|
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738 public: |
| 1565 | 739 int remap_instruction_operand_from_cache(int operand); // operand must be biased by CPCACHE_INDEX_TAG |
| 0 | 740 |
|
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741 private: |
| 0 | 742 // Used while constructing constant pool (only by ClassFileParser) |
| 743 jint klass_index_at(int which) { | |
| 744 assert(tag_at(which).is_klass_index(), "Corrupted constant pool"); | |
| 745 return *int_at_addr(which); | |
| 746 } | |
| 747 | |
| 748 jint string_index_at(int which) { | |
| 749 assert(tag_at(which).is_string_index(), "Corrupted constant pool"); | |
| 750 return *int_at_addr(which); | |
| 751 } | |
| 752 | |
| 753 // Performs the LinkResolver checks | |
| 754 static void verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle klass, TRAPS); | |
| 755 | |
| 756 // Implementation of methods that needs an exposed 'this' pointer, in order to | |
| 757 // handle GC while executing the method | |
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758 static Klass* klass_at_impl(constantPoolHandle this_oop, int which, TRAPS); |
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759 static oop string_at_impl(constantPoolHandle this_oop, int which, int obj_index, TRAPS); |
| 0 | 760 |
| 761 // Resolve string constants (to prevent allocation during compilation) | |
| 762 static void resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS); | |
| 763 | |
| 1602 | 764 static oop resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS); |
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765 static void save_and_throw_exception(constantPoolHandle this_oop, int which, int tag_value, TRAPS); |
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766 static oop resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS); |
| 1602 | 767 |
| 0 | 768 public: |
|
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769 // Merging ConstantPool* support: |
| 0 | 770 bool compare_entry_to(int index1, constantPoolHandle cp2, int index2, TRAPS); |
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771 void copy_cp_to(int start_i, int end_i, constantPoolHandle to_cp, int to_i, TRAPS) { |
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772 constantPoolHandle h_this(THREAD, this); |
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773 copy_cp_to_impl(h_this, start_i, end_i, to_cp, to_i, THREAD); |
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774 } |
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775 static void copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i, constantPoolHandle to_cp, int to_i, TRAPS); |
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776 static void copy_entry_to(constantPoolHandle from_cp, int from_i, constantPoolHandle to_cp, int to_i, TRAPS); |
|
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777 static void copy_operands(constantPoolHandle from_cp, constantPoolHandle to_cp, TRAPS); |
| 0 | 778 int find_matching_entry(int pattern_i, constantPoolHandle search_cp, TRAPS); |
|
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779 int version() const { return _saved._version; } |
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780 void set_version(int version) { _saved._version = version; } |
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781 void increment_and_save_version(int version) { |
| 7625 | 782 _saved._version = version >= 0 ? (version + 1) : version; // keep overflow |
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783 } |
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784 |
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785 void set_resolved_reference_length(int length) { _saved._resolved_reference_length = length; } |
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786 int resolved_reference_length() const { return _saved._resolved_reference_length; } |
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787 void set_lock(Monitor* lock) { _lock = lock; } |
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788 Monitor* lock() { return _lock; } |
| 0 | 789 |
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790 // Decrease ref counts of symbols that are in the constant pool |
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791 // when the holder class is unloaded |
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792 void unreference_symbols(); |
| 0 | 793 |
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794 // Deallocate constant pool for RedefineClasses |
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795 void deallocate_contents(ClassLoaderData* loader_data); |
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796 void release_C_heap_structures(); |
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797 |
| 0 | 798 // JVMTI accesss - GetConstantPool, RetransformClasses, ... |
| 799 friend class JvmtiConstantPoolReconstituter; | |
| 800 | |
| 801 private: | |
| 802 jint cpool_entry_size(jint idx); | |
| 803 jint hash_entries_to(SymbolHashMap *symmap, SymbolHashMap *classmap); | |
| 804 | |
| 805 // Copy cpool bytes into byte array. | |
| 806 // Returns: | |
| 807 // int > 0, count of the raw cpool bytes that have been copied | |
| 808 // 0, OutOfMemory error | |
| 809 // -1, Internal error | |
| 810 int copy_cpool_bytes(int cpool_size, | |
| 811 SymbolHashMap* tbl, | |
| 812 unsigned char *bytes); | |
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813 |
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814 public: |
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815 // Verify |
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816 void verify_on(outputStream* st); |
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817 |
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818 // Printing |
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819 void print_on(outputStream* st) const; |
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820 void print_value_on(outputStream* st) const; |
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821 void print_entry_on(int index, outputStream* st); |
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822 |
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823 const char* internal_name() const { return "{constant pool}"; } |
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824 |
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825 #ifndef PRODUCT |
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826 // Compile the world support |
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827 static void preload_and_initialize_all_classes(ConstantPool* constant_pool, TRAPS); |
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828 #endif |
| 0 | 829 }; |
| 830 | |
| 6197 | 831 class SymbolHashMapEntry : public CHeapObj<mtSymbol> { |
| 0 | 832 private: |
| 833 unsigned int _hash; // 32-bit hash for item | |
| 834 SymbolHashMapEntry* _next; // Next element in the linked list for this bucket | |
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835 Symbol* _symbol; // 1-st part of the mapping: symbol => value |
| 0 | 836 u2 _value; // 2-nd part of the mapping: symbol => value |
| 837 | |
| 838 public: | |
| 839 unsigned int hash() const { return _hash; } | |
| 840 void set_hash(unsigned int hash) { _hash = hash; } | |
| 841 | |
| 842 SymbolHashMapEntry* next() const { return _next; } | |
| 843 void set_next(SymbolHashMapEntry* next) { _next = next; } | |
| 844 | |
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845 Symbol* symbol() const { return _symbol; } |
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846 void set_symbol(Symbol* sym) { _symbol = sym; } |
| 0 | 847 |
| 848 u2 value() const { return _value; } | |
| 849 void set_value(u2 value) { _value = value; } | |
| 850 | |
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851 SymbolHashMapEntry(unsigned int hash, Symbol* symbol, u2 value) |
| 0 | 852 : _hash(hash), _symbol(symbol), _value(value), _next(NULL) {} |
| 853 | |
| 854 }; // End SymbolHashMapEntry class | |
| 855 | |
| 856 | |
| 6197 | 857 class SymbolHashMapBucket : public CHeapObj<mtSymbol> { |
| 0 | 858 |
| 859 private: | |
| 860 SymbolHashMapEntry* _entry; | |
| 861 | |
| 862 public: | |
| 863 SymbolHashMapEntry* entry() const { return _entry; } | |
| 864 void set_entry(SymbolHashMapEntry* entry) { _entry = entry; } | |
| 865 void clear() { _entry = NULL; } | |
| 866 | |
| 867 }; // End SymbolHashMapBucket class | |
| 868 | |
| 869 | |
| 6197 | 870 class SymbolHashMap: public CHeapObj<mtSymbol> { |
| 0 | 871 |
| 872 private: | |
| 873 // Default number of entries in the table | |
| 874 enum SymbolHashMap_Constants { | |
| 875 _Def_HashMap_Size = 256 | |
| 876 }; | |
| 877 | |
| 878 int _table_size; | |
| 879 SymbolHashMapBucket* _buckets; | |
| 880 | |
| 881 void initialize_table(int table_size) { | |
| 882 _table_size = table_size; | |
| 6197 | 883 _buckets = NEW_C_HEAP_ARRAY(SymbolHashMapBucket, table_size, mtSymbol); |
| 0 | 884 for (int index = 0; index < table_size; index++) { |
| 885 _buckets[index].clear(); | |
| 886 } | |
| 887 } | |
| 888 | |
| 889 public: | |
| 890 | |
| 891 int table_size() const { return _table_size; } | |
| 892 | |
| 893 SymbolHashMap() { initialize_table(_Def_HashMap_Size); } | |
| 894 SymbolHashMap(int table_size) { initialize_table(table_size); } | |
| 895 | |
| 896 // hash P(31) from Kernighan & Ritchie | |
| 897 static unsigned int compute_hash(const char* str, int len) { | |
| 898 unsigned int hash = 0; | |
| 899 while (len-- > 0) { | |
| 900 hash = 31*hash + (unsigned) *str; | |
| 901 str++; | |
| 902 } | |
| 903 return hash; | |
| 904 } | |
| 905 | |
| 906 SymbolHashMapEntry* bucket(int i) { | |
| 907 return _buckets[i].entry(); | |
| 908 } | |
| 909 | |
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910 void add_entry(Symbol* sym, u2 value); |
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911 SymbolHashMapEntry* find_entry(Symbol* sym); |
| 0 | 912 |
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913 u2 symbol_to_value(Symbol* sym) { |
| 0 | 914 SymbolHashMapEntry *entry = find_entry(sym); |
| 915 return (entry == NULL) ? 0 : entry->value(); | |
| 916 } | |
| 917 | |
| 918 ~SymbolHashMap() { | |
| 919 SymbolHashMapEntry* next; | |
| 920 for (int i = 0; i < _table_size; i++) { | |
| 921 for (SymbolHashMapEntry* cur = bucket(i); cur != NULL; cur = next) { | |
| 922 next = cur->next(); | |
| 923 delete(cur); | |
| 924 } | |
| 925 } | |
| 926 delete _buckets; | |
| 927 } | |
| 928 }; // End SymbolHashMap class | |
| 1972 | 929 |
| 930 #endif // SHARE_VM_OOPS_CONSTANTPOOLOOP_HPP |