Mercurial > hg > graal-compiler
annotate src/share/vm/oops/constantPool.hpp @ 7168:73e64867adb7
8003690: Example code in JVMTI GetStackTrace documentation is broken
Summary: Fixed to minor errors in example code
Reviewed-by: sspitsyn, dholmes
author | mikael |
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date | Wed, 21 Nov 2012 09:02:13 -0800 |
parents | 18fb7da42534 |
children | e522a00b91aa b14da2e6f2dc |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #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 |
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83 class ConstantPool : public Metadata { |
0 | 84 friend class VMStructs; |
85 friend class BytecodeInterpreter; // Directly extracts an oop in the pool for fast instanceof/checkcast | |
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86 friend class Universe; // For null constructor |
0 | 87 private: |
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88 Array<u1>* _tags; // the tag array describing the constant pool's contents |
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89 ConstantPoolCache* _cache; // the cache holding interpreter runtime information |
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90 InstanceKlass* _pool_holder; // the corresponding class |
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91 Array<u2>* _operands; // for variable-sized (InvokeDynamic) nodes, usually empty |
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92 |
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93 // Array of resolved objects from the constant pool and map from resolved |
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94 // object index to original constant pool index |
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95 jobject _resolved_references; |
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96 Array<u2>* _reference_map; |
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97 |
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98 int _flags; // a few header bits to describe contents for GC |
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99 int _length; // number of elements in the array |
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100 |
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101 bool _on_stack; // Redefined method still executing refers to this constant pool. |
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102 |
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103 union { |
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104 // set for CDS to restore resolved references |
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105 int _resolved_reference_length; |
0 | 106 // only set to non-zero if constant pool is merged by RedefineClasses |
107 int _orig_length; | |
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108 } _saved; |
0 | 109 |
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110 Monitor* _lock; |
0 | 111 |
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112 void set_tags(Array<u1>* tags) { _tags = tags; } |
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113 void tag_at_put(int which, jbyte t) { tags()->at_put(which, t); } |
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114 void release_tag_at_put(int which, jbyte t) { tags()->release_at_put(which, t); } |
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115 |
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116 void set_operands(Array<u2>* operands) { _operands = operands; } |
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117 |
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118 enum FlagBit { |
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119 FB_has_invokedynamic = 1, |
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120 FB_has_pseudo_string = 2, |
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121 FB_has_preresolution = 3 |
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122 }; |
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123 |
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124 int flags() const { return _flags; } |
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125 void set_flags(int f) { _flags = f; } |
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126 bool flag_at(FlagBit fb) const { return (_flags & (1 << (int)fb)) != 0; } |
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127 void set_flag_at(FlagBit fb); |
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128 // no clear_flag_at function; they only increase |
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129 |
0 | 130 private: |
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131 intptr_t* base() const { return (intptr_t*) (((char*) this) + sizeof(ConstantPool)); } |
0 | 132 |
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133 CPSlot slot_at(int which) { |
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134 assert(is_within_bounds(which), "index out of bounds"); |
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135 // Uses volatile because the klass slot changes without a lock. |
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136 volatile intptr_t adr = (intptr_t)OrderAccess::load_ptr_acquire(obj_at_addr_raw(which)); |
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137 assert(adr != 0 || which == 0, "cp entry for klass should not be zero"); |
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138 return CPSlot(adr); |
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139 } |
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140 |
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141 void slot_at_put(int which, CPSlot s) const { |
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142 assert(is_within_bounds(which), "index out of bounds"); |
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143 assert(s.value() != 0, "Caught something"); |
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144 *(intptr_t*)&base()[which] = s.value(); |
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145 } |
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146 intptr_t* obj_at_addr_raw(int which) const { |
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147 assert(is_within_bounds(which), "index out of bounds"); |
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148 return (intptr_t*) &base()[which]; |
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149 } |
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150 |
0 | 151 jint* int_at_addr(int which) const { |
152 assert(is_within_bounds(which), "index out of bounds"); | |
153 return (jint*) &base()[which]; | |
154 } | |
155 | |
156 jlong* long_at_addr(int which) const { | |
157 assert(is_within_bounds(which), "index out of bounds"); | |
158 return (jlong*) &base()[which]; | |
159 } | |
160 | |
161 jfloat* float_at_addr(int which) const { | |
162 assert(is_within_bounds(which), "index out of bounds"); | |
163 return (jfloat*) &base()[which]; | |
164 } | |
165 | |
166 jdouble* double_at_addr(int which) const { | |
167 assert(is_within_bounds(which), "index out of bounds"); | |
168 return (jdouble*) &base()[which]; | |
169 } | |
170 | |
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171 ConstantPool(Array<u1>* tags); |
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172 ConstantPool() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } |
0 | 173 public: |
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174 static ConstantPool* allocate(ClassLoaderData* loader_data, int length, TRAPS); |
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175 |
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176 bool is_constantPool() const volatile { return true; } |
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177 |
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178 Array<u1>* tags() const { return _tags; } |
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179 Array<u2>* operands() const { return _operands; } |
0 | 180 |
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181 bool has_pseudo_string() const { return flag_at(FB_has_pseudo_string); } |
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182 bool has_invokedynamic() const { return flag_at(FB_has_invokedynamic); } |
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183 bool has_preresolution() const { return flag_at(FB_has_preresolution); } |
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184 void set_pseudo_string() { set_flag_at(FB_has_pseudo_string); } |
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185 void set_invokedynamic() { set_flag_at(FB_has_invokedynamic); } |
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186 void set_preresolution() { set_flag_at(FB_has_preresolution); } |
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187 |
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188 // Redefine classes support. If a method refering to this constant pool |
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189 // is on the executing stack, or as a handle in vm code, this constant pool |
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190 // can't be removed from the set of previous versions saved in the instance |
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191 // class. |
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192 bool on_stack() const { return _on_stack; } |
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193 void set_on_stack(const bool value); |
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194 |
0 | 195 // Klass holding pool |
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196 InstanceKlass* pool_holder() const { return _pool_holder; } |
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197 void set_pool_holder(InstanceKlass* k) { _pool_holder = k; } |
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198 InstanceKlass** pool_holder_addr() { return &_pool_holder; } |
0 | 199 |
200 // Interpreter runtime support | |
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201 ConstantPoolCache* cache() const { return _cache; } |
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202 void set_cache(ConstantPoolCache* cache){ _cache = cache; } |
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203 |
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204 // Create object cache in the constant pool |
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205 void initialize_resolved_references(ClassLoaderData* loader_data, |
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206 intStack reference_map, |
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207 int constant_pool_map_length, |
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208 TRAPS); |
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209 |
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210 // resolved strings, methodHandles and callsite objects from the constant pool |
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211 objArrayOop resolved_references() const; |
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212 // mapping resolved object array indexes to cp indexes and back. |
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213 int object_to_cp_index(int index) { return _reference_map->at(index); } |
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214 int cp_to_object_index(int index); |
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215 |
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216 // Invokedynamic indexes. |
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217 // They must look completely different from normal indexes. |
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218 // The main reason is that byte swapping is sometimes done on normal indexes. |
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219 // Finally, it is helpful for debugging to tell the two apart. |
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220 static bool is_invokedynamic_index(int i) { return (i < 0); } |
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221 static int decode_invokedynamic_index(int i) { assert(is_invokedynamic_index(i), ""); return ~i; } |
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222 static int encode_invokedynamic_index(int i) { assert(!is_invokedynamic_index(i), ""); return ~i; } |
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223 |
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224 |
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225 // The invokedynamic points at a CP cache entry. This entry points back |
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226 // at the original CP entry (CONSTANT_InvokeDynamic) and also (via f2) at an entry |
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227 // in the resolved_references array (which provides the appendix argument). |
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228 int invokedynamic_cp_cache_index(int index) const { |
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229 assert (is_invokedynamic_index(index), "should be a invokedynamic index"); |
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230 int cache_index = decode_invokedynamic_index(index); |
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231 return cache_index; |
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232 } |
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233 ConstantPoolCacheEntry* invokedynamic_cp_cache_entry_at(int index) const { |
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234 // decode index that invokedynamic points to. |
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235 int cp_cache_index = invokedynamic_cp_cache_index(index); |
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236 return cache()->entry_at(cp_cache_index); |
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237 } |
0 | 238 |
239 // Assembly code support | |
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240 static int tags_offset_in_bytes() { return offset_of(ConstantPool, _tags); } |
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241 static int cache_offset_in_bytes() { return offset_of(ConstantPool, _cache); } |
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242 static int pool_holder_offset_in_bytes() { return offset_of(ConstantPool, _pool_holder); } |
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243 static int resolved_references_offset_in_bytes() { return offset_of(ConstantPool, _resolved_references); } |
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244 static int reference_map_offset_in_bytes() { return offset_of(ConstantPool, _reference_map); } |
0 | 245 |
246 // Storing constants | |
247 | |
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248 void klass_at_put(int which, Klass* k) { |
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249 assert(k != NULL, "resolved class shouldn't be null"); |
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250 assert(is_within_bounds(which), "index out of bounds"); |
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251 OrderAccess::release_store_ptr((Klass* volatile *)obj_at_addr_raw(which), k); |
0 | 252 // The interpreter assumes when the tag is stored, the klass is resolved |
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253 // and the Klass* is a klass rather than a Symbol*, so we need |
0 | 254 // hardware store ordering here. |
255 release_tag_at_put(which, JVM_CONSTANT_Class); | |
256 } | |
257 | |
258 // For temporary use while constructing constant pool | |
259 void klass_index_at_put(int which, int name_index) { | |
260 tag_at_put(which, JVM_CONSTANT_ClassIndex); | |
261 *int_at_addr(which) = name_index; | |
262 } | |
263 | |
264 // Temporary until actual use | |
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265 void unresolved_klass_at_put(int which, Symbol* s) { |
0 | 266 release_tag_at_put(which, JVM_CONSTANT_UnresolvedClass); |
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267 slot_at_put(which, s); |
0 | 268 } |
269 | |
1602 | 270 void method_handle_index_at_put(int which, int ref_kind, int ref_index) { |
271 tag_at_put(which, JVM_CONSTANT_MethodHandle); | |
272 *int_at_addr(which) = ((jint) ref_index<<16) | ref_kind; | |
273 } | |
274 | |
275 void method_type_index_at_put(int which, int ref_index) { | |
276 tag_at_put(which, JVM_CONSTANT_MethodType); | |
277 *int_at_addr(which) = ref_index; | |
278 } | |
279 | |
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280 void invoke_dynamic_at_put(int which, int bootstrap_specifier_index, int name_and_type_index) { |
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281 tag_at_put(which, JVM_CONSTANT_InvokeDynamic); |
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282 *int_at_addr(which) = ((jint) name_and_type_index<<16) | bootstrap_specifier_index; |
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283 } |
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284 |
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285 void unresolved_string_at_put(int which, Symbol* s) { |
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286 release_tag_at_put(which, JVM_CONSTANT_String); |
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287 *symbol_at_addr(which) = s; |
0 | 288 } |
289 | |
290 void int_at_put(int which, jint i) { | |
291 tag_at_put(which, JVM_CONSTANT_Integer); | |
292 *int_at_addr(which) = i; | |
293 } | |
294 | |
295 void long_at_put(int which, jlong l) { | |
296 tag_at_put(which, JVM_CONSTANT_Long); | |
297 // *long_at_addr(which) = l; | |
298 Bytes::put_native_u8((address)long_at_addr(which), *((u8*) &l)); | |
299 } | |
300 | |
301 void float_at_put(int which, jfloat f) { | |
302 tag_at_put(which, JVM_CONSTANT_Float); | |
303 *float_at_addr(which) = f; | |
304 } | |
305 | |
306 void double_at_put(int which, jdouble d) { | |
307 tag_at_put(which, JVM_CONSTANT_Double); | |
308 // *double_at_addr(which) = d; | |
309 // u8 temp = *(u8*) &d; | |
310 Bytes::put_native_u8((address) double_at_addr(which), *((u8*) &d)); | |
311 } | |
312 | |
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313 Symbol** symbol_at_addr(int which) const { |
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314 assert(is_within_bounds(which), "index out of bounds"); |
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315 return (Symbol**) &base()[which]; |
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316 } |
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317 |
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318 void symbol_at_put(int which, Symbol* s) { |
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319 assert(s->refcount() != 0, "should have nonzero refcount"); |
0 | 320 tag_at_put(which, JVM_CONSTANT_Utf8); |
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321 *symbol_at_addr(which) = s; |
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322 } |
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323 |
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324 void string_at_put(int which, int obj_index, oop str) { |
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325 resolved_references()->obj_at_put(obj_index, str); |
0 | 326 } |
327 | |
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328 void set_object_tag_at(int which) { |
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329 release_tag_at_put(which, JVM_CONSTANT_Object); |
0 | 330 } |
331 | |
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332 void object_at_put(int which, oop obj) { |
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333 resolved_references()->obj_at_put(cp_to_object_index(which), obj); |
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334 } |
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335 |
0 | 336 // For temporary use while constructing constant pool |
337 void string_index_at_put(int which, int string_index) { | |
338 tag_at_put(which, JVM_CONSTANT_StringIndex); | |
339 *int_at_addr(which) = string_index; | |
340 } | |
341 | |
342 void field_at_put(int which, int class_index, int name_and_type_index) { | |
343 tag_at_put(which, JVM_CONSTANT_Fieldref); | |
344 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; | |
345 } | |
346 | |
347 void method_at_put(int which, int class_index, int name_and_type_index) { | |
348 tag_at_put(which, JVM_CONSTANT_Methodref); | |
349 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; | |
350 } | |
351 | |
352 void interface_method_at_put(int which, int class_index, int name_and_type_index) { | |
353 tag_at_put(which, JVM_CONSTANT_InterfaceMethodref); | |
354 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; // Not so nice | |
355 } | |
356 | |
357 void name_and_type_at_put(int which, int name_index, int signature_index) { | |
358 tag_at_put(which, JVM_CONSTANT_NameAndType); | |
359 *int_at_addr(which) = ((jint) signature_index<<16) | name_index; // Not so nice | |
360 } | |
361 | |
362 // Tag query | |
363 | |
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364 constantTag tag_at(int which) const { return (constantTag)tags()->at_acquire(which); } |
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365 |
0 | 366 // Fetching constants |
367 | |
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368 Klass* klass_at(int which, TRAPS) { |
0 | 369 constantPoolHandle h_this(THREAD, this); |
370 return klass_at_impl(h_this, which, CHECK_NULL); | |
371 } | |
372 | |
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373 Symbol* klass_name_at(int which); // Returns the name, w/o resolving. |
0 | 374 |
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375 Klass* resolved_klass_at(int which) { // Used by Compiler |
0 | 376 guarantee(tag_at(which).is_klass(), "Corrupted constant pool"); |
377 // Must do an acquire here in case another thread resolved the klass | |
378 // behind our back, lest we later load stale values thru the oop. | |
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379 return CPSlot((Klass*)OrderAccess::load_ptr_acquire(obj_at_addr_raw(which))).get_klass(); |
0 | 380 } |
381 | |
382 // This method should only be used with a cpool lock or during parsing or gc | |
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383 Symbol* unresolved_klass_at(int which) { // Temporary until actual use |
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384 Symbol* s = CPSlot((Symbol*)OrderAccess::load_ptr_acquire(obj_at_addr_raw(which))).get_symbol(); |
0 | 385 // check that the klass is still unresolved. |
386 assert(tag_at(which).is_unresolved_klass(), "Corrupted constant pool"); | |
387 return s; | |
388 } | |
389 | |
390 // RedefineClasses() API support: | |
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391 Symbol* klass_at_noresolve(int which) { return klass_name_at(which); } |
0 | 392 |
393 jint int_at(int which) { | |
394 assert(tag_at(which).is_int(), "Corrupted constant pool"); | |
395 return *int_at_addr(which); | |
396 } | |
397 | |
398 jlong long_at(int which) { | |
399 assert(tag_at(which).is_long(), "Corrupted constant pool"); | |
400 // return *long_at_addr(which); | |
401 u8 tmp = Bytes::get_native_u8((address)&base()[which]); | |
402 return *((jlong*)&tmp); | |
403 } | |
404 | |
405 jfloat float_at(int which) { | |
406 assert(tag_at(which).is_float(), "Corrupted constant pool"); | |
407 return *float_at_addr(which); | |
408 } | |
409 | |
410 jdouble double_at(int which) { | |
411 assert(tag_at(which).is_double(), "Corrupted constant pool"); | |
412 u8 tmp = Bytes::get_native_u8((address)&base()[which]); | |
413 return *((jdouble*)&tmp); | |
414 } | |
415 | |
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416 Symbol* symbol_at(int which) { |
0 | 417 assert(tag_at(which).is_utf8(), "Corrupted constant pool"); |
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418 return *symbol_at_addr(which); |
0 | 419 } |
420 | |
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421 oop string_at(int which, int obj_index, TRAPS) { |
0 | 422 constantPoolHandle h_this(THREAD, this); |
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423 return string_at_impl(h_this, which, obj_index, THREAD); |
0 | 424 } |
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425 oop string_at(int which, TRAPS) { |
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426 int obj_index = cp_to_object_index(which); |
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427 return string_at(which, obj_index, THREAD); |
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428 } |
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429 |
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430 // Version that can be used before string oop array is created. |
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431 oop uncached_string_at(int which, TRAPS); |
0 | 432 |
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433 oop object_at(int which) { |
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434 assert(tag_at(which).is_object(), "Corrupted constant pool"); |
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435 int obj_index = cp_to_object_index(which); |
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436 return resolved_references()->obj_at(obj_index); |
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437 } |
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438 |
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439 // A "pseudo-string" is an non-string oop that has found is way into |
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440 // a String entry. |
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441 // Under EnableInvokeDynamic this can happen if the user patches a live |
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442 // object into a CONSTANT_String entry of an anonymous class. |
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443 // Method oops internally created for method handles may also |
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444 // use pseudo-strings to link themselves to related metaobjects. |
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445 |
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446 bool is_pseudo_string_at(int which) { |
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447 // A pseudo string is a string that doesn't have a symbol in the cpSlot |
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448 return unresolved_string_at(which) == NULL; |
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449 } |
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450 |
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451 oop pseudo_string_at(int which, int obj_index) { |
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452 assert(tag_at(which).is_string(), "Corrupted constant pool"); |
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453 assert(unresolved_string_at(which) == NULL, "shouldn't have symbol"); |
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454 oop s = resolved_references()->obj_at(obj_index); |
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455 return s; |
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456 } |
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457 |
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458 void pseudo_string_at_put(int which, int obj_index, oop x) { |
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459 assert(EnableInvokeDynamic, ""); |
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460 set_pseudo_string(); // mark header |
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461 assert(tag_at(which).is_string(), "Corrupted constant pool"); |
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462 string_at_put(which, obj_index, x); // this works just fine |
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463 } |
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464 |
0 | 465 // only called when we are sure a string entry is already resolved (via an |
466 // earlier string_at call. | |
467 oop resolved_string_at(int which) { | |
468 assert(tag_at(which).is_string(), "Corrupted constant pool"); | |
469 // Must do an acquire here in case another thread resolved the klass | |
470 // behind our back, lest we later load stale values thru the oop. | |
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471 // we might want a volatile_obj_at in ObjArrayKlass. |
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472 int obj_index = cp_to_object_index(which); |
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473 return resolved_references()->obj_at(obj_index); |
0 | 474 } |
475 | |
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476 Symbol* unresolved_string_at(int which) { |
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477 assert(tag_at(which).is_string(), "Corrupted constant pool"); |
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478 Symbol* s = *symbol_at_addr(which); |
0 | 479 return s; |
480 } | |
481 | |
482 // Returns an UTF8 for a CONSTANT_String entry at a given index. | |
483 // UTF8 char* representation was chosen to avoid conversion of | |
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484 // java_lang_Strings at resolved entries into Symbol*s |
0 | 485 // or vice versa. |
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486 // Caller is responsible for checking for pseudo-strings. |
0 | 487 char* string_at_noresolve(int which); |
488 | |
489 jint name_and_type_at(int which) { | |
490 assert(tag_at(which).is_name_and_type(), "Corrupted constant pool"); | |
491 return *int_at_addr(which); | |
492 } | |
493 | |
1602 | 494 int method_handle_ref_kind_at(int which) { |
495 assert(tag_at(which).is_method_handle(), "Corrupted constant pool"); | |
496 return extract_low_short_from_int(*int_at_addr(which)); // mask out unwanted ref_index bits | |
497 } | |
498 int method_handle_index_at(int which) { | |
499 assert(tag_at(which).is_method_handle(), "Corrupted constant pool"); | |
500 return extract_high_short_from_int(*int_at_addr(which)); // shift out unwanted ref_kind bits | |
501 } | |
502 int method_type_index_at(int which) { | |
503 assert(tag_at(which).is_method_type(), "Corrupted constant pool"); | |
504 return *int_at_addr(which); | |
505 } | |
506 // Derived queries: | |
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507 Symbol* method_handle_name_ref_at(int which) { |
1602 | 508 int member = method_handle_index_at(which); |
509 return impl_name_ref_at(member, true); | |
510 } | |
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511 Symbol* method_handle_signature_ref_at(int which) { |
1602 | 512 int member = method_handle_index_at(which); |
513 return impl_signature_ref_at(member, true); | |
514 } | |
515 int method_handle_klass_index_at(int which) { | |
516 int member = method_handle_index_at(which); | |
517 return impl_klass_ref_index_at(member, true); | |
518 } | |
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519 Symbol* method_type_signature_at(int which) { |
1602 | 520 int sym = method_type_index_at(which); |
521 return symbol_at(sym); | |
522 } | |
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523 |
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524 int invoke_dynamic_name_and_type_ref_index_at(int which) { |
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525 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool"); |
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526 return extract_high_short_from_int(*int_at_addr(which)); |
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527 } |
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528 int invoke_dynamic_bootstrap_specifier_index(int which) { |
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529 assert(tag_at(which).value() == JVM_CONSTANT_InvokeDynamic, "Corrupted constant pool"); |
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530 return extract_low_short_from_int(*int_at_addr(which)); |
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531 } |
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532 int invoke_dynamic_operand_base(int which) { |
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533 int bootstrap_specifier_index = invoke_dynamic_bootstrap_specifier_index(which); |
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534 return operand_offset_at(operands(), bootstrap_specifier_index); |
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535 } |
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536 // The first part of the operands array consists of an index into the second part. |
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537 // Extract a 32-bit index value from the first part. |
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538 static int operand_offset_at(Array<u2>* operands, int bootstrap_specifier_index) { |
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539 int n = (bootstrap_specifier_index * 2); |
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540 assert(n >= 0 && n+2 <= operands->length(), "oob"); |
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541 // The first 32-bit index points to the beginning of the second part |
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542 // of the operands array. Make sure this index is in the first part. |
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543 DEBUG_ONLY(int second_part = build_int_from_shorts(operands->at(0), |
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544 operands->at(1))); |
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545 assert(second_part == 0 || n+2 <= second_part, "oob (2)"); |
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546 int offset = build_int_from_shorts(operands->at(n+0), |
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547 operands->at(n+1)); |
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548 // The offset itself must point into the second part of the array. |
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549 assert(offset == 0 || offset >= second_part && offset <= operands->length(), "oob (3)"); |
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550 return offset; |
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551 } |
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552 static void operand_offset_at_put(Array<u2>* operands, int bootstrap_specifier_index, int offset) { |
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553 int n = bootstrap_specifier_index * 2; |
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554 assert(n >= 0 && n+2 <= operands->length(), "oob"); |
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555 operands->at_put(n+0, extract_low_short_from_int(offset)); |
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556 operands->at_put(n+1, extract_high_short_from_int(offset)); |
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557 } |
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558 static int operand_array_length(Array<u2>* operands) { |
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559 if (operands == NULL || operands->length() == 0) return 0; |
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560 int second_part = operand_offset_at(operands, 0); |
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561 return (second_part / 2); |
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562 } |
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563 |
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564 #ifdef ASSERT |
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565 // operand tuples fit together exactly, end to end |
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566 static int operand_limit_at(Array<u2>* operands, int bootstrap_specifier_index) { |
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567 int nextidx = bootstrap_specifier_index + 1; |
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568 if (nextidx == operand_array_length(operands)) |
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569 return operands->length(); |
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570 else |
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571 return operand_offset_at(operands, nextidx); |
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572 } |
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573 int invoke_dynamic_operand_limit(int which) { |
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574 int bootstrap_specifier_index = invoke_dynamic_bootstrap_specifier_index(which); |
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575 return operand_limit_at(operands(), bootstrap_specifier_index); |
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576 } |
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577 #endif //ASSERT |
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578 |
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579 // layout of InvokeDynamic bootstrap method specifier (in second part of operands array): |
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580 enum { |
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581 _indy_bsm_offset = 0, // CONSTANT_MethodHandle bsm |
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582 _indy_argc_offset = 1, // u2 argc |
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583 _indy_argv_offset = 2 // u2 argv[argc] |
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584 }; |
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585 int invoke_dynamic_bootstrap_method_ref_index_at(int which) { |
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586 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool"); |
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587 int op_base = invoke_dynamic_operand_base(which); |
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588 return operands()->at(op_base + _indy_bsm_offset); |
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589 } |
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590 int invoke_dynamic_argument_count_at(int which) { |
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591 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool"); |
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592 int op_base = invoke_dynamic_operand_base(which); |
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593 int argc = operands()->at(op_base + _indy_argc_offset); |
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594 DEBUG_ONLY(int end_offset = op_base + _indy_argv_offset + argc; |
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595 int next_offset = invoke_dynamic_operand_limit(which)); |
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596 assert(end_offset == next_offset, "matched ending"); |
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597 return argc; |
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598 } |
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599 int invoke_dynamic_argument_index_at(int which, int j) { |
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600 int op_base = invoke_dynamic_operand_base(which); |
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601 DEBUG_ONLY(int argc = operands()->at(op_base + _indy_argc_offset)); |
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602 assert((uint)j < (uint)argc, "oob"); |
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603 return operands()->at(op_base + _indy_argv_offset + j); |
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604 } |
1602 | 605 |
726
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606 // The following methods (name/signature/klass_ref_at, klass_ref_at_noresolve, |
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607 // name_and_type_ref_index_at) all expect to be passed indices obtained |
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608 // directly from the bytecode. |
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609 // If the indices are meant to refer to fields or methods, they are |
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610 // actually rewritten constant pool cache indices. |
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611 // The routine remap_instruction_operand_from_cache manages the adjustment |
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612 // of these values back to constant pool indices. |
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613 |
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614 // There are also "uncached" versions which do not adjust the operand index; see below. |
0 | 615 |
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616 // FIXME: Consider renaming these with a prefix "cached_" to make the distinction clear. |
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617 // In a few cases (the verifier) there are uses before a cpcache has been built, |
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618 // which are handled by a dynamic check in remap_instruction_operand_from_cache. |
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619 // FIXME: Remove the dynamic check, and adjust all callers to specify the correct mode. |
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620 |
0 | 621 // Lookup for entries consisting of (klass_index, name_and_type index) |
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622 Klass* klass_ref_at(int which, TRAPS); |
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623 Symbol* klass_ref_at_noresolve(int which); |
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624 Symbol* name_ref_at(int which) { return impl_name_ref_at(which, false); } |
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625 Symbol* signature_ref_at(int which) { return impl_signature_ref_at(which, false); } |
0 | 626 |
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627 int klass_ref_index_at(int which) { return impl_klass_ref_index_at(which, false); } |
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628 int name_and_type_ref_index_at(int which) { return impl_name_and_type_ref_index_at(which, false); } |
0 | 629 |
630 // Lookup for entries consisting of (name_index, signature_index) | |
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631 int name_ref_index_at(int which_nt); // == low-order jshort of name_and_type_at(which_nt) |
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632 int signature_ref_index_at(int which_nt); // == high-order jshort of name_and_type_at(which_nt) |
0 | 633 |
634 BasicType basic_type_for_signature_at(int which); | |
635 | |
636 // Resolve string constants (to prevent allocation during compilation) | |
637 void resolve_string_constants(TRAPS) { | |
638 constantPoolHandle h_this(THREAD, this); | |
639 resolve_string_constants_impl(h_this, CHECK); | |
640 } | |
641 | |
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642 // CDS support |
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643 void remove_unshareable_info(); |
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644 void restore_unshareable_info(TRAPS); |
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645 bool resolve_class_constants(TRAPS); |
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646 // The ConstantPool vtable is restored by this call when the ConstantPool is |
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647 // in the shared archive. See patch_klass_vtables() in metaspaceShared.cpp for |
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648 // all the gory details. SA, dtrace and pstack helpers distinguish metadata |
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649 // by their vtable. |
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650 void restore_vtable() { guarantee(is_constantPool(), "vtable restored by this call"); } |
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651 |
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652 private: |
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653 enum { _no_index_sentinel = -1, _possible_index_sentinel = -2 }; |
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654 public: |
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655 |
1602 | 656 // Resolve late bound constants. |
657 oop resolve_constant_at(int index, TRAPS) { | |
658 constantPoolHandle h_this(THREAD, this); | |
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659 return resolve_constant_at_impl(h_this, index, _no_index_sentinel, THREAD); |
1602 | 660 } |
661 | |
662 oop resolve_cached_constant_at(int cache_index, TRAPS) { | |
663 constantPoolHandle h_this(THREAD, this); | |
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664 return resolve_constant_at_impl(h_this, _no_index_sentinel, cache_index, THREAD); |
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665 } |
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666 |
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667 oop resolve_possibly_cached_constant_at(int pool_index, TRAPS) { |
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668 constantPoolHandle h_this(THREAD, this); |
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669 return resolve_constant_at_impl(h_this, pool_index, _possible_index_sentinel, THREAD); |
1602 | 670 } |
671 | |
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672 oop resolve_bootstrap_specifier_at(int index, TRAPS) { |
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673 constantPoolHandle h_this(THREAD, this); |
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674 return resolve_bootstrap_specifier_at_impl(h_this, index, THREAD); |
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675 } |
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676 |
0 | 677 // Klass name matches name at offset |
678 bool klass_name_at_matches(instanceKlassHandle k, int which); | |
679 | |
680 // Sizing | |
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681 int length() const { return _length; } |
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682 void set_length(int length) { _length = length; } |
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683 |
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684 // Tells whether index is within bounds. |
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685 bool is_within_bounds(int index) const { |
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686 return 0 <= index && index < length(); |
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687 } |
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688 |
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689 static int header_size() { return sizeof(ConstantPool)/HeapWordSize; } |
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690 static int size(int length) { return align_object_size(header_size() + length); } |
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691 int size() const { return size(length()); } |
0 | 692 |
693 friend class ClassFileParser; | |
694 friend class SystemDictionary; | |
695 | |
696 // Used by compiler to prevent classloading. | |
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697 static Method* method_at_if_loaded (constantPoolHandle this_oop, int which); |
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698 static bool has_appendix_at_if_loaded (constantPoolHandle this_oop, int which); |
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699 static oop appendix_at_if_loaded (constantPoolHandle this_oop, int which); |
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700 static bool has_method_type_at_if_loaded (constantPoolHandle this_oop, int which); |
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701 static oop method_type_at_if_loaded (constantPoolHandle this_oop, int which); |
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702 static Klass* klass_at_if_loaded (constantPoolHandle this_oop, int which); |
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703 static Klass* klass_ref_at_if_loaded (constantPoolHandle this_oop, int which); |
0 | 704 // Same as above - but does LinkResolving. |
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705 static Klass* klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int which, TRAPS); |
0 | 706 |
707 // Routines currently used for annotations (only called by jvm.cpp) but which might be used in the | |
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708 // future by other Java code. These take constant pool indices rather than |
0 | 709 // constant pool cache indices as do the peer methods above. |
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710 Symbol* uncached_klass_ref_at_noresolve(int which); |
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711 Symbol* uncached_name_ref_at(int which) { return impl_name_ref_at(which, true); } |
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712 Symbol* uncached_signature_ref_at(int which) { return impl_signature_ref_at(which, true); } |
726
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713 int uncached_klass_ref_index_at(int which) { return impl_klass_ref_index_at(which, true); } |
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714 int uncached_name_and_type_ref_index_at(int which) { return impl_name_and_type_ref_index_at(which, true); } |
0 | 715 |
716 // Sharing | |
717 int pre_resolve_shared_klasses(TRAPS); | |
718 | |
719 // Debugging | |
720 const char* printable_name_at(int which) PRODUCT_RETURN0; | |
721 | |
1565 | 722 #ifdef ASSERT |
723 enum { CPCACHE_INDEX_TAG = 0x10000 }; // helps keep CP cache indices distinct from CP indices | |
1602 | 724 #else |
725 enum { CPCACHE_INDEX_TAG = 0 }; // in product mode, this zero value is a no-op | |
1565 | 726 #endif //ASSERT |
727 | |
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728 static int decode_cpcache_index(int raw_index, bool invokedynamic_ok = false) { |
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729 if (invokedynamic_ok && is_invokedynamic_index(raw_index)) |
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730 return decode_invokedynamic_index(raw_index); |
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731 else |
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732 return raw_index - CPCACHE_INDEX_TAG; |
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733 } |
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734 |
0 | 735 private: |
736 | |
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737 void set_resolved_references(jobject s) { _resolved_references = s; } |
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738 Array<u2>* reference_map() const { return _reference_map; } |
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739 void set_reference_map(Array<u2>* o) { _reference_map = o; } |
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740 |
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741 // patch JSR 292 resolved references after the class is linked. |
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742 void patch_resolved_references(GrowableArray<Handle>* cp_patches); |
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743 |
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744 Symbol* impl_name_ref_at(int which, bool uncached); |
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745 Symbol* impl_signature_ref_at(int which, bool uncached); |
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746 int impl_klass_ref_index_at(int which, bool uncached); |
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747 int impl_name_and_type_ref_index_at(int which, bool uncached); |
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748 |
1565 | 749 int remap_instruction_operand_from_cache(int operand); // operand must be biased by CPCACHE_INDEX_TAG |
0 | 750 |
751 // Used while constructing constant pool (only by ClassFileParser) | |
752 jint klass_index_at(int which) { | |
753 assert(tag_at(which).is_klass_index(), "Corrupted constant pool"); | |
754 return *int_at_addr(which); | |
755 } | |
756 | |
757 jint string_index_at(int which) { | |
758 assert(tag_at(which).is_string_index(), "Corrupted constant pool"); | |
759 return *int_at_addr(which); | |
760 } | |
761 | |
762 // Performs the LinkResolver checks | |
763 static void verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle klass, TRAPS); | |
764 | |
765 // Implementation of methods that needs an exposed 'this' pointer, in order to | |
766 // handle GC while executing the method | |
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767 static Klass* klass_at_impl(constantPoolHandle this_oop, int which, TRAPS); |
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768 static oop string_at_impl(constantPoolHandle this_oop, int which, int obj_index, TRAPS); |
0 | 769 |
770 // Resolve string constants (to prevent allocation during compilation) | |
771 static void resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS); | |
772 | |
1602 | 773 static oop resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS); |
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774 static void save_and_throw_exception(constantPoolHandle this_oop, int which, int tag_value, TRAPS); |
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775 static oop resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS); |
1602 | 776 |
0 | 777 public: |
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778 // Merging ConstantPool* support: |
0 | 779 bool compare_entry_to(int index1, constantPoolHandle cp2, int index2, TRAPS); |
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780 void copy_cp_to(int start_i, int end_i, constantPoolHandle to_cp, int to_i, TRAPS) { |
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781 constantPoolHandle h_this(THREAD, this); |
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782 copy_cp_to_impl(h_this, start_i, end_i, to_cp, to_i, THREAD); |
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783 } |
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784 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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785 static void copy_entry_to(constantPoolHandle from_cp, int from_i, constantPoolHandle to_cp, int to_i, TRAPS); |
0 | 786 int find_matching_entry(int pattern_i, constantPoolHandle search_cp, TRAPS); |
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787 int orig_length() const { return _saved._orig_length; } |
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788 void set_orig_length(int orig_length) { _saved._orig_length = orig_length; } |
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789 |
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790 void set_resolved_reference_length(int length) { _saved._resolved_reference_length = length; } |
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791 int resolved_reference_length() const { return _saved._resolved_reference_length; } |
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792 void set_lock(Monitor* lock) { _lock = lock; } |
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793 Monitor* lock() { return _lock; } |
0 | 794 |
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795 // Decrease ref counts of symbols that are in the constant pool |
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796 // when the holder class is unloaded |
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797 void unreference_symbols(); |
0 | 798 |
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799 // Deallocate constant pool for RedefineClasses |
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800 void deallocate_contents(ClassLoaderData* loader_data); |
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801 void release_C_heap_structures(); |
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802 |
0 | 803 // JVMTI accesss - GetConstantPool, RetransformClasses, ... |
804 friend class JvmtiConstantPoolReconstituter; | |
805 | |
806 private: | |
807 jint cpool_entry_size(jint idx); | |
808 jint hash_entries_to(SymbolHashMap *symmap, SymbolHashMap *classmap); | |
809 | |
810 // Copy cpool bytes into byte array. | |
811 // Returns: | |
812 // int > 0, count of the raw cpool bytes that have been copied | |
813 // 0, OutOfMemory error | |
814 // -1, Internal error | |
815 int copy_cpool_bytes(int cpool_size, | |
816 SymbolHashMap* tbl, | |
817 unsigned char *bytes); | |
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818 |
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819 public: |
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820 // Verify |
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821 void verify_on(outputStream* st); |
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822 |
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823 // Printing |
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824 void print_on(outputStream* st) const; |
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825 void print_value_on(outputStream* st) const; |
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826 void print_entry_on(int index, outputStream* st); |
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827 |
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828 const char* internal_name() const { return "{constant pool}"; } |
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829 |
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830 #ifndef PRODUCT |
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831 // Compile the world support |
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832 static void preload_and_initialize_all_classes(ConstantPool* constant_pool, TRAPS); |
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833 #endif |
0 | 834 }; |
835 | |
6197 | 836 class SymbolHashMapEntry : public CHeapObj<mtSymbol> { |
0 | 837 private: |
838 unsigned int _hash; // 32-bit hash for item | |
839 SymbolHashMapEntry* _next; // Next element in the linked list for this bucket | |
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840 Symbol* _symbol; // 1-st part of the mapping: symbol => value |
0 | 841 u2 _value; // 2-nd part of the mapping: symbol => value |
842 | |
843 public: | |
844 unsigned int hash() const { return _hash; } | |
845 void set_hash(unsigned int hash) { _hash = hash; } | |
846 | |
847 SymbolHashMapEntry* next() const { return _next; } | |
848 void set_next(SymbolHashMapEntry* next) { _next = next; } | |
849 | |
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850 Symbol* symbol() const { return _symbol; } |
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851 void set_symbol(Symbol* sym) { _symbol = sym; } |
0 | 852 |
853 u2 value() const { return _value; } | |
854 void set_value(u2 value) { _value = value; } | |
855 | |
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856 SymbolHashMapEntry(unsigned int hash, Symbol* symbol, u2 value) |
0 | 857 : _hash(hash), _symbol(symbol), _value(value), _next(NULL) {} |
858 | |
859 }; // End SymbolHashMapEntry class | |
860 | |
861 | |
6197 | 862 class SymbolHashMapBucket : public CHeapObj<mtSymbol> { |
0 | 863 |
864 private: | |
865 SymbolHashMapEntry* _entry; | |
866 | |
867 public: | |
868 SymbolHashMapEntry* entry() const { return _entry; } | |
869 void set_entry(SymbolHashMapEntry* entry) { _entry = entry; } | |
870 void clear() { _entry = NULL; } | |
871 | |
872 }; // End SymbolHashMapBucket class | |
873 | |
874 | |
6197 | 875 class SymbolHashMap: public CHeapObj<mtSymbol> { |
0 | 876 |
877 private: | |
878 // Default number of entries in the table | |
879 enum SymbolHashMap_Constants { | |
880 _Def_HashMap_Size = 256 | |
881 }; | |
882 | |
883 int _table_size; | |
884 SymbolHashMapBucket* _buckets; | |
885 | |
886 void initialize_table(int table_size) { | |
887 _table_size = table_size; | |
6197 | 888 _buckets = NEW_C_HEAP_ARRAY(SymbolHashMapBucket, table_size, mtSymbol); |
0 | 889 for (int index = 0; index < table_size; index++) { |
890 _buckets[index].clear(); | |
891 } | |
892 } | |
893 | |
894 public: | |
895 | |
896 int table_size() const { return _table_size; } | |
897 | |
898 SymbolHashMap() { initialize_table(_Def_HashMap_Size); } | |
899 SymbolHashMap(int table_size) { initialize_table(table_size); } | |
900 | |
901 // hash P(31) from Kernighan & Ritchie | |
902 static unsigned int compute_hash(const char* str, int len) { | |
903 unsigned int hash = 0; | |
904 while (len-- > 0) { | |
905 hash = 31*hash + (unsigned) *str; | |
906 str++; | |
907 } | |
908 return hash; | |
909 } | |
910 | |
911 SymbolHashMapEntry* bucket(int i) { | |
912 return _buckets[i].entry(); | |
913 } | |
914 | |
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915 void add_entry(Symbol* sym, u2 value); |
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916 SymbolHashMapEntry* find_entry(Symbol* sym); |
0 | 917 |
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918 u2 symbol_to_value(Symbol* sym) { |
0 | 919 SymbolHashMapEntry *entry = find_entry(sym); |
920 return (entry == NULL) ? 0 : entry->value(); | |
921 } | |
922 | |
923 ~SymbolHashMap() { | |
924 SymbolHashMapEntry* next; | |
925 for (int i = 0; i < _table_size; i++) { | |
926 for (SymbolHashMapEntry* cur = bucket(i); cur != NULL; cur = next) { | |
927 next = cur->next(); | |
928 delete(cur); | |
929 } | |
930 } | |
931 delete _buckets; | |
932 } | |
933 }; // End SymbolHashMap class | |
1972 | 934 |
935 #endif // SHARE_VM_OOPS_CONSTANTPOOLOOP_HPP |