Wed, 27 Apr 2016 01:25:04 +0800
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http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17
1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
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23 */
25 #ifndef SHARE_VM_OOPS_CONSTANTPOOLOOP_HPP
26 #define SHARE_VM_OOPS_CONSTANTPOOLOOP_HPP
28 #include "oops/arrayOop.hpp"
29 #include "oops/cpCache.hpp"
30 #include "oops/objArrayOop.hpp"
31 #include "oops/symbol.hpp"
32 #include "oops/typeArrayOop.hpp"
33 #include "runtime/handles.hpp"
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
44 #ifdef TARGET_ARCH_arm
45 # include "bytes_arm.hpp"
46 #endif
47 #ifdef TARGET_ARCH_ppc
48 # include "bytes_ppc.hpp"
49 #endif
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
55 // is safe. For klass types, the constant pool entry is
56 // modified when the entry is resolved. If a klass constant pool
57 // entry is read without a lock, only the resolved state guarantees that
58 // the entry in the constant pool is a klass object and not a Symbol*.
60 class SymbolHashMap;
62 class CPSlot VALUE_OBJ_CLASS_SPEC {
63 intptr_t _ptr;
64 public:
65 CPSlot(intptr_t ptr): _ptr(ptr) {}
66 CPSlot(Klass* ptr): _ptr((intptr_t)ptr) {}
67 CPSlot(Symbol* ptr): _ptr((intptr_t)ptr | 1) {}
69 intptr_t value() { return _ptr; }
70 bool is_resolved() { return (_ptr & 1) == 0; }
71 bool is_unresolved() { return (_ptr & 1) == 1; }
73 Symbol* get_symbol() {
74 assert(is_unresolved(), "bad call");
75 return (Symbol*)(_ptr & ~1);
76 }
77 Klass* get_klass() {
78 assert(is_resolved(), "bad call");
79 return (Klass*)_ptr;
80 }
81 };
83 class KlassSizeStats;
84 class ConstantPool : public Metadata {
85 friend class VMStructs;
86 friend class BytecodeInterpreter; // Directly extracts an oop in the pool for fast instanceof/checkcast
87 friend class Universe; // For null constructor
88 private:
89 Array<u1>* _tags; // the tag array describing the constant pool's contents
90 ConstantPoolCache* _cache; // the cache holding interpreter runtime information
91 InstanceKlass* _pool_holder; // the corresponding class
92 Array<u2>* _operands; // for variable-sized (InvokeDynamic) nodes, usually empty
94 // Array of resolved objects from the constant pool and map from resolved
95 // object index to original constant pool index
96 jobject _resolved_references;
97 Array<u2>* _reference_map;
99 enum {
100 _has_preresolution = 1, // Flags
101 _on_stack = 2
102 };
104 int _flags; // old fashioned bit twiddling
105 int _length; // number of elements in the array
107 union {
108 // set for CDS to restore resolved references
109 int _resolved_reference_length;
110 // keeps version number for redefined classes (used in backtrace)
111 int _version;
112 } _saved;
114 Monitor* _lock;
116 void set_tags(Array<u1>* tags) { _tags = tags; }
117 void tag_at_put(int which, jbyte t) { tags()->at_put(which, t); }
118 void release_tag_at_put(int which, jbyte t) { tags()->release_at_put(which, t); }
120 void set_operands(Array<u2>* operands) { _operands = operands; }
122 int flags() const { return _flags; }
123 void set_flags(int f) { _flags = f; }
125 private:
126 intptr_t* base() const { return (intptr_t*) (((char*) this) + sizeof(ConstantPool)); }
128 CPSlot slot_at(int which) {
129 assert(is_within_bounds(which), "index out of bounds");
130 // Uses volatile because the klass slot changes without a lock.
131 volatile intptr_t adr = (intptr_t)OrderAccess::load_ptr_acquire(obj_at_addr_raw(which));
132 assert(adr != 0 || which == 0, "cp entry for klass should not be zero");
133 return CPSlot(adr);
134 }
136 void slot_at_put(int which, CPSlot s) const {
137 assert(is_within_bounds(which), "index out of bounds");
138 assert(s.value() != 0, "Caught something");
139 *(intptr_t*)&base()[which] = s.value();
140 }
141 intptr_t* obj_at_addr_raw(int which) const {
142 assert(is_within_bounds(which), "index out of bounds");
143 return (intptr_t*) &base()[which];
144 }
146 jint* int_at_addr(int which) const {
147 assert(is_within_bounds(which), "index out of bounds");
148 return (jint*) &base()[which];
149 }
151 jlong* long_at_addr(int which) const {
152 assert(is_within_bounds(which), "index out of bounds");
153 return (jlong*) &base()[which];
154 }
156 jfloat* float_at_addr(int which) const {
157 assert(is_within_bounds(which), "index out of bounds");
158 return (jfloat*) &base()[which];
159 }
161 jdouble* double_at_addr(int which) const {
162 assert(is_within_bounds(which), "index out of bounds");
163 return (jdouble*) &base()[which];
164 }
166 ConstantPool(Array<u1>* tags);
167 ConstantPool() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
168 public:
169 static ConstantPool* allocate(ClassLoaderData* loader_data, int length, TRAPS);
171 bool is_constantPool() const volatile { return true; }
173 Array<u1>* tags() const { return _tags; }
174 Array<u2>* operands() const { return _operands; }
176 bool has_preresolution() const { return (_flags & _has_preresolution) != 0; }
177 void set_has_preresolution() { _flags |= _has_preresolution; }
179 // Redefine classes support. If a method refering to this constant pool
180 // is on the executing stack, or as a handle in vm code, this constant pool
181 // can't be removed from the set of previous versions saved in the instance
182 // class.
183 bool on_stack() const { return (_flags &_on_stack) != 0; }
184 void set_on_stack(const bool value);
186 // Klass holding pool
187 InstanceKlass* pool_holder() const { return _pool_holder; }
188 void set_pool_holder(InstanceKlass* k) { _pool_holder = k; }
189 InstanceKlass** pool_holder_addr() { return &_pool_holder; }
191 // Interpreter runtime support
192 ConstantPoolCache* cache() const { return _cache; }
193 void set_cache(ConstantPoolCache* cache){ _cache = cache; }
195 // Create object cache in the constant pool
196 void initialize_resolved_references(ClassLoaderData* loader_data,
197 intStack reference_map,
198 int constant_pool_map_length,
199 TRAPS);
201 // resolved strings, methodHandles and callsite objects from the constant pool
202 objArrayOop resolved_references() const;
203 // mapping resolved object array indexes to cp indexes and back.
204 int object_to_cp_index(int index) { return _reference_map->at(index); }
205 int cp_to_object_index(int index);
207 // Invokedynamic indexes.
208 // They must look completely different from normal indexes.
209 // The main reason is that byte swapping is sometimes done on normal indexes.
210 // Finally, it is helpful for debugging to tell the two apart.
211 static bool is_invokedynamic_index(int i) { return (i < 0); }
212 static int decode_invokedynamic_index(int i) { assert(is_invokedynamic_index(i), ""); return ~i; }
213 static int encode_invokedynamic_index(int i) { assert(!is_invokedynamic_index(i), ""); return ~i; }
216 // The invokedynamic points at a CP cache entry. This entry points back
217 // at the original CP entry (CONSTANT_InvokeDynamic) and also (via f2) at an entry
218 // in the resolved_references array (which provides the appendix argument).
219 int invokedynamic_cp_cache_index(int index) const {
220 assert (is_invokedynamic_index(index), "should be a invokedynamic index");
221 int cache_index = decode_invokedynamic_index(index);
222 return cache_index;
223 }
224 ConstantPoolCacheEntry* invokedynamic_cp_cache_entry_at(int index) const {
225 // decode index that invokedynamic points to.
226 int cp_cache_index = invokedynamic_cp_cache_index(index);
227 return cache()->entry_at(cp_cache_index);
228 }
230 // Assembly code support
231 static int tags_offset_in_bytes() { return offset_of(ConstantPool, _tags); }
232 static int cache_offset_in_bytes() { return offset_of(ConstantPool, _cache); }
233 static int pool_holder_offset_in_bytes() { return offset_of(ConstantPool, _pool_holder); }
234 static int resolved_references_offset_in_bytes() { return offset_of(ConstantPool, _resolved_references); }
236 // Storing constants
238 void klass_at_put(int which, Klass* k) {
239 assert(k != NULL, "resolved class shouldn't be null");
240 assert(is_within_bounds(which), "index out of bounds");
241 OrderAccess::release_store_ptr((Klass* volatile *)obj_at_addr_raw(which), k);
242 // The interpreter assumes when the tag is stored, the klass is resolved
243 // and the Klass* is a klass rather than a Symbol*, so we need
244 // hardware store ordering here.
245 release_tag_at_put(which, JVM_CONSTANT_Class);
246 }
248 // For temporary use while constructing constant pool
249 void klass_index_at_put(int which, int name_index) {
250 tag_at_put(which, JVM_CONSTANT_ClassIndex);
251 *int_at_addr(which) = name_index;
252 }
254 // Temporary until actual use
255 void unresolved_klass_at_put(int which, Symbol* s) {
256 release_tag_at_put(which, JVM_CONSTANT_UnresolvedClass);
257 slot_at_put(which, s);
258 }
260 void method_handle_index_at_put(int which, int ref_kind, int ref_index) {
261 tag_at_put(which, JVM_CONSTANT_MethodHandle);
262 *int_at_addr(which) = ((jint) ref_index<<16) | ref_kind;
263 }
265 void method_type_index_at_put(int which, int ref_index) {
266 tag_at_put(which, JVM_CONSTANT_MethodType);
267 *int_at_addr(which) = ref_index;
268 }
270 void invoke_dynamic_at_put(int which, int bootstrap_specifier_index, int name_and_type_index) {
271 tag_at_put(which, JVM_CONSTANT_InvokeDynamic);
272 *int_at_addr(which) = ((jint) name_and_type_index<<16) | bootstrap_specifier_index;
273 }
275 void unresolved_string_at_put(int which, Symbol* s) {
276 release_tag_at_put(which, JVM_CONSTANT_String);
277 *symbol_at_addr(which) = s;
278 }
280 void int_at_put(int which, jint i) {
281 tag_at_put(which, JVM_CONSTANT_Integer);
282 *int_at_addr(which) = i;
283 }
285 void long_at_put(int which, jlong l) {
286 tag_at_put(which, JVM_CONSTANT_Long);
287 // *long_at_addr(which) = l;
288 Bytes::put_native_u8((address)long_at_addr(which), *((u8*) &l));
289 }
291 void float_at_put(int which, jfloat f) {
292 tag_at_put(which, JVM_CONSTANT_Float);
293 *float_at_addr(which) = f;
294 }
296 void double_at_put(int which, jdouble d) {
297 tag_at_put(which, JVM_CONSTANT_Double);
298 // *double_at_addr(which) = d;
299 // u8 temp = *(u8*) &d;
300 Bytes::put_native_u8((address) double_at_addr(which), *((u8*) &d));
301 }
303 Symbol** symbol_at_addr(int which) const {
304 assert(is_within_bounds(which), "index out of bounds");
305 return (Symbol**) &base()[which];
306 }
308 void symbol_at_put(int which, Symbol* s) {
309 assert(s->refcount() != 0, "should have nonzero refcount");
310 tag_at_put(which, JVM_CONSTANT_Utf8);
311 *symbol_at_addr(which) = s;
312 }
314 void string_at_put(int which, int obj_index, oop str) {
315 resolved_references()->obj_at_put(obj_index, str);
316 }
318 // For temporary use while constructing constant pool
319 void string_index_at_put(int which, int string_index) {
320 tag_at_put(which, JVM_CONSTANT_StringIndex);
321 *int_at_addr(which) = string_index;
322 }
324 void field_at_put(int which, int class_index, int name_and_type_index) {
325 tag_at_put(which, JVM_CONSTANT_Fieldref);
326 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index;
327 }
329 void method_at_put(int which, int class_index, int name_and_type_index) {
330 tag_at_put(which, JVM_CONSTANT_Methodref);
331 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index;
332 }
334 void interface_method_at_put(int which, int class_index, int name_and_type_index) {
335 tag_at_put(which, JVM_CONSTANT_InterfaceMethodref);
336 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; // Not so nice
337 }
339 void name_and_type_at_put(int which, int name_index, int signature_index) {
340 tag_at_put(which, JVM_CONSTANT_NameAndType);
341 *int_at_addr(which) = ((jint) signature_index<<16) | name_index; // Not so nice
342 }
344 // Tag query
346 constantTag tag_at(int which) const { return (constantTag)tags()->at_acquire(which); }
348 // Fetching constants
350 Klass* klass_at(int which, TRAPS) {
351 constantPoolHandle h_this(THREAD, this);
352 return klass_at_impl(h_this, which, CHECK_NULL);
353 }
355 Symbol* klass_name_at(int which); // Returns the name, w/o resolving.
357 Klass* resolved_klass_at(int which) const { // Used by Compiler
358 guarantee(tag_at(which).is_klass(), "Corrupted constant pool");
359 // Must do an acquire here in case another thread resolved the klass
360 // behind our back, lest we later load stale values thru the oop.
361 return CPSlot((Klass*)OrderAccess::load_ptr_acquire(obj_at_addr_raw(which))).get_klass();
362 }
364 // This method should only be used with a cpool lock or during parsing or gc
365 Symbol* unresolved_klass_at(int which) { // Temporary until actual use
366 Symbol* s = CPSlot((Symbol*)OrderAccess::load_ptr_acquire(obj_at_addr_raw(which))).get_symbol();
367 // check that the klass is still unresolved.
368 assert(tag_at(which).is_unresolved_klass(), "Corrupted constant pool");
369 return s;
370 }
372 // RedefineClasses() API support:
373 Symbol* klass_at_noresolve(int which) { return klass_name_at(which); }
375 jint int_at(int which) {
376 assert(tag_at(which).is_int(), "Corrupted constant pool");
377 return *int_at_addr(which);
378 }
380 jlong long_at(int which) {
381 assert(tag_at(which).is_long(), "Corrupted constant pool");
382 // return *long_at_addr(which);
383 u8 tmp = Bytes::get_native_u8((address)&base()[which]);
384 return *((jlong*)&tmp);
385 }
387 jfloat float_at(int which) {
388 assert(tag_at(which).is_float(), "Corrupted constant pool");
389 return *float_at_addr(which);
390 }
392 jdouble double_at(int which) {
393 assert(tag_at(which).is_double(), "Corrupted constant pool");
394 u8 tmp = Bytes::get_native_u8((address)&base()[which]);
395 return *((jdouble*)&tmp);
396 }
398 Symbol* symbol_at(int which) {
399 assert(tag_at(which).is_utf8(), "Corrupted constant pool");
400 return *symbol_at_addr(which);
401 }
403 oop string_at(int which, int obj_index, TRAPS) {
404 constantPoolHandle h_this(THREAD, this);
405 return string_at_impl(h_this, which, obj_index, THREAD);
406 }
407 oop string_at(int which, TRAPS) {
408 int obj_index = cp_to_object_index(which);
409 return string_at(which, obj_index, THREAD);
410 }
412 // Version that can be used before string oop array is created.
413 oop uncached_string_at(int which, TRAPS);
415 // A "pseudo-string" is an non-string oop that has found is way into
416 // a String entry.
417 // Under EnableInvokeDynamic this can happen if the user patches a live
418 // object into a CONSTANT_String entry of an anonymous class.
419 // Method oops internally created for method handles may also
420 // use pseudo-strings to link themselves to related metaobjects.
422 bool is_pseudo_string_at(int which) {
423 // A pseudo string is a string that doesn't have a symbol in the cpSlot
424 return unresolved_string_at(which) == NULL;
425 }
427 oop pseudo_string_at(int which, int obj_index) {
428 assert(tag_at(which).is_string(), "Corrupted constant pool");
429 assert(unresolved_string_at(which) == NULL, "shouldn't have symbol");
430 oop s = resolved_references()->obj_at(obj_index);
431 return s;
432 }
434 oop pseudo_string_at(int which) {
435 assert(tag_at(which).is_string(), "Corrupted constant pool");
436 assert(unresolved_string_at(which) == NULL, "shouldn't have symbol");
437 int obj_index = cp_to_object_index(which);
438 oop s = resolved_references()->obj_at(obj_index);
439 return s;
440 }
442 void pseudo_string_at_put(int which, int obj_index, oop x) {
443 assert(EnableInvokeDynamic, "");
444 assert(tag_at(which).is_string(), "Corrupted constant pool");
445 unresolved_string_at_put(which, NULL); // indicates patched string
446 string_at_put(which, obj_index, x); // this works just fine
447 }
449 // only called when we are sure a string entry is already resolved (via an
450 // earlier string_at call.
451 oop resolved_string_at(int which) {
452 assert(tag_at(which).is_string(), "Corrupted constant pool");
453 // Must do an acquire here in case another thread resolved the klass
454 // behind our back, lest we later load stale values thru the oop.
455 // we might want a volatile_obj_at in ObjArrayKlass.
456 int obj_index = cp_to_object_index(which);
457 return resolved_references()->obj_at(obj_index);
458 }
460 Symbol* unresolved_string_at(int which) {
461 assert(tag_at(which).is_string(), "Corrupted constant pool");
462 Symbol* s = *symbol_at_addr(which);
463 return s;
464 }
466 // Returns an UTF8 for a CONSTANT_String entry at a given index.
467 // UTF8 char* representation was chosen to avoid conversion of
468 // java_lang_Strings at resolved entries into Symbol*s
469 // or vice versa.
470 // Caller is responsible for checking for pseudo-strings.
471 char* string_at_noresolve(int which);
473 jint name_and_type_at(int which) {
474 assert(tag_at(which).is_name_and_type(), "Corrupted constant pool");
475 return *int_at_addr(which);
476 }
478 private:
479 int method_handle_ref_kind_at(int which, bool error_ok) {
480 assert(tag_at(which).is_method_handle() ||
481 (error_ok && tag_at(which).is_method_handle_in_error()), "Corrupted constant pool");
482 return extract_low_short_from_int(*int_at_addr(which)); // mask out unwanted ref_index bits
483 }
484 int method_handle_index_at(int which, bool error_ok) {
485 assert(tag_at(which).is_method_handle() ||
486 (error_ok && tag_at(which).is_method_handle_in_error()), "Corrupted constant pool");
487 return extract_high_short_from_int(*int_at_addr(which)); // shift out unwanted ref_kind bits
488 }
489 int method_type_index_at(int which, bool error_ok) {
490 assert(tag_at(which).is_method_type() ||
491 (error_ok && tag_at(which).is_method_type_in_error()), "Corrupted constant pool");
492 return *int_at_addr(which);
493 }
494 public:
495 int method_handle_ref_kind_at(int which) {
496 return method_handle_ref_kind_at(which, false);
497 }
498 int method_handle_ref_kind_at_error_ok(int which) {
499 return method_handle_ref_kind_at(which, true);
500 }
501 int method_handle_index_at(int which) {
502 return method_handle_index_at(which, false);
503 }
504 int method_handle_index_at_error_ok(int which) {
505 return method_handle_index_at(which, true);
506 }
507 int method_type_index_at(int which) {
508 return method_type_index_at(which, false);
509 }
510 int method_type_index_at_error_ok(int which) {
511 return method_type_index_at(which, true);
512 }
514 // Derived queries:
515 Symbol* method_handle_name_ref_at(int which) {
516 int member = method_handle_index_at(which);
517 return impl_name_ref_at(member, true);
518 }
519 Symbol* method_handle_signature_ref_at(int which) {
520 int member = method_handle_index_at(which);
521 return impl_signature_ref_at(member, true);
522 }
523 int method_handle_klass_index_at(int which) {
524 int member = method_handle_index_at(which);
525 return impl_klass_ref_index_at(member, true);
526 }
527 Symbol* method_type_signature_at(int which) {
528 int sym = method_type_index_at(which);
529 return symbol_at(sym);
530 }
532 int invoke_dynamic_name_and_type_ref_index_at(int which) {
533 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool");
534 return extract_high_short_from_int(*int_at_addr(which));
535 }
536 int invoke_dynamic_bootstrap_specifier_index(int which) {
537 assert(tag_at(which).value() == JVM_CONSTANT_InvokeDynamic, "Corrupted constant pool");
538 return extract_low_short_from_int(*int_at_addr(which));
539 }
540 int invoke_dynamic_operand_base(int which) {
541 int bootstrap_specifier_index = invoke_dynamic_bootstrap_specifier_index(which);
542 return operand_offset_at(operands(), bootstrap_specifier_index);
543 }
544 // The first part of the operands array consists of an index into the second part.
545 // Extract a 32-bit index value from the first part.
546 static int operand_offset_at(Array<u2>* operands, int bootstrap_specifier_index) {
547 int n = (bootstrap_specifier_index * 2);
548 assert(n >= 0 && n+2 <= operands->length(), "oob");
549 // The first 32-bit index points to the beginning of the second part
550 // of the operands array. Make sure this index is in the first part.
551 DEBUG_ONLY(int second_part = build_int_from_shorts(operands->at(0),
552 operands->at(1)));
553 assert(second_part == 0 || n+2 <= second_part, "oob (2)");
554 int offset = build_int_from_shorts(operands->at(n+0),
555 operands->at(n+1));
556 // The offset itself must point into the second part of the array.
557 assert(offset == 0 || offset >= second_part && offset <= operands->length(), "oob (3)");
558 return offset;
559 }
560 static void operand_offset_at_put(Array<u2>* operands, int bootstrap_specifier_index, int offset) {
561 int n = bootstrap_specifier_index * 2;
562 assert(n >= 0 && n+2 <= operands->length(), "oob");
563 operands->at_put(n+0, extract_low_short_from_int(offset));
564 operands->at_put(n+1, extract_high_short_from_int(offset));
565 }
566 static int operand_array_length(Array<u2>* operands) {
567 if (operands == NULL || operands->length() == 0) return 0;
568 int second_part = operand_offset_at(operands, 0);
569 return (second_part / 2);
570 }
572 #ifdef ASSERT
573 // operand tuples fit together exactly, end to end
574 static int operand_limit_at(Array<u2>* operands, int bootstrap_specifier_index) {
575 int nextidx = bootstrap_specifier_index + 1;
576 if (nextidx == operand_array_length(operands))
577 return operands->length();
578 else
579 return operand_offset_at(operands, nextidx);
580 }
581 int invoke_dynamic_operand_limit(int which) {
582 int bootstrap_specifier_index = invoke_dynamic_bootstrap_specifier_index(which);
583 return operand_limit_at(operands(), bootstrap_specifier_index);
584 }
585 #endif //ASSERT
587 // layout of InvokeDynamic bootstrap method specifier (in second part of operands array):
588 enum {
589 _indy_bsm_offset = 0, // CONSTANT_MethodHandle bsm
590 _indy_argc_offset = 1, // u2 argc
591 _indy_argv_offset = 2 // u2 argv[argc]
592 };
594 // These functions are used in RedefineClasses for CP merge
596 int operand_offset_at(int bootstrap_specifier_index) {
597 assert(0 <= bootstrap_specifier_index &&
598 bootstrap_specifier_index < operand_array_length(operands()),
599 "Corrupted CP operands");
600 return operand_offset_at(operands(), bootstrap_specifier_index);
601 }
602 int operand_bootstrap_method_ref_index_at(int bootstrap_specifier_index) {
603 int offset = operand_offset_at(bootstrap_specifier_index);
604 return operands()->at(offset + _indy_bsm_offset);
605 }
606 int operand_argument_count_at(int bootstrap_specifier_index) {
607 int offset = operand_offset_at(bootstrap_specifier_index);
608 int argc = operands()->at(offset + _indy_argc_offset);
609 return argc;
610 }
611 int operand_argument_index_at(int bootstrap_specifier_index, int j) {
612 int offset = operand_offset_at(bootstrap_specifier_index);
613 return operands()->at(offset + _indy_argv_offset + j);
614 }
615 int operand_next_offset_at(int bootstrap_specifier_index) {
616 int offset = operand_offset_at(bootstrap_specifier_index) + _indy_argv_offset
617 + operand_argument_count_at(bootstrap_specifier_index);
618 return offset;
619 }
620 // Compare a bootsrap specifier in the operands arrays
621 bool compare_operand_to(int bootstrap_specifier_index1, constantPoolHandle cp2,
622 int bootstrap_specifier_index2, TRAPS);
623 // Find a bootsrap specifier in the operands array
624 int find_matching_operand(int bootstrap_specifier_index, constantPoolHandle search_cp,
625 int operands_cur_len, TRAPS);
626 // Resize the operands array with delta_len and delta_size
627 void resize_operands(int delta_len, int delta_size, TRAPS);
628 // Extend the operands array with the length and size of the ext_cp operands
629 void extend_operands(constantPoolHandle ext_cp, TRAPS);
630 // Shrink the operands array to a smaller array with new_len length
631 void shrink_operands(int new_len, TRAPS);
634 int invoke_dynamic_bootstrap_method_ref_index_at(int which) {
635 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool");
636 int op_base = invoke_dynamic_operand_base(which);
637 return operands()->at(op_base + _indy_bsm_offset);
638 }
639 int invoke_dynamic_argument_count_at(int which) {
640 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool");
641 int op_base = invoke_dynamic_operand_base(which);
642 int argc = operands()->at(op_base + _indy_argc_offset);
643 DEBUG_ONLY(int end_offset = op_base + _indy_argv_offset + argc;
644 int next_offset = invoke_dynamic_operand_limit(which));
645 assert(end_offset == next_offset, "matched ending");
646 return argc;
647 }
648 int invoke_dynamic_argument_index_at(int which, int j) {
649 int op_base = invoke_dynamic_operand_base(which);
650 DEBUG_ONLY(int argc = operands()->at(op_base + _indy_argc_offset));
651 assert((uint)j < (uint)argc, "oob");
652 return operands()->at(op_base + _indy_argv_offset + j);
653 }
655 // The following methods (name/signature/klass_ref_at, klass_ref_at_noresolve,
656 // name_and_type_ref_index_at) all expect to be passed indices obtained
657 // directly from the bytecode.
658 // If the indices are meant to refer to fields or methods, they are
659 // actually rewritten constant pool cache indices.
660 // The routine remap_instruction_operand_from_cache manages the adjustment
661 // of these values back to constant pool indices.
663 // There are also "uncached" versions which do not adjust the operand index; see below.
665 // FIXME: Consider renaming these with a prefix "cached_" to make the distinction clear.
666 // In a few cases (the verifier) there are uses before a cpcache has been built,
667 // which are handled by a dynamic check in remap_instruction_operand_from_cache.
668 // FIXME: Remove the dynamic check, and adjust all callers to specify the correct mode.
670 // Lookup for entries consisting of (klass_index, name_and_type index)
671 Klass* klass_ref_at(int which, TRAPS);
672 Symbol* klass_ref_at_noresolve(int which);
673 Symbol* name_ref_at(int which) { return impl_name_ref_at(which, false); }
674 Symbol* signature_ref_at(int which) { return impl_signature_ref_at(which, false); }
676 int klass_ref_index_at(int which) { return impl_klass_ref_index_at(which, false); }
677 int name_and_type_ref_index_at(int which) { return impl_name_and_type_ref_index_at(which, false); }
679 // Lookup for entries consisting of (name_index, signature_index)
680 int name_ref_index_at(int which_nt); // == low-order jshort of name_and_type_at(which_nt)
681 int signature_ref_index_at(int which_nt); // == high-order jshort of name_and_type_at(which_nt)
683 BasicType basic_type_for_signature_at(int which);
685 // Resolve string constants (to prevent allocation during compilation)
686 void resolve_string_constants(TRAPS) {
687 constantPoolHandle h_this(THREAD, this);
688 resolve_string_constants_impl(h_this, CHECK);
689 }
691 // CDS support
692 void remove_unshareable_info();
693 void restore_unshareable_info(TRAPS);
694 bool resolve_class_constants(TRAPS);
695 // The ConstantPool vtable is restored by this call when the ConstantPool is
696 // in the shared archive. See patch_klass_vtables() in metaspaceShared.cpp for
697 // all the gory details. SA, dtrace and pstack helpers distinguish metadata
698 // by their vtable.
699 void restore_vtable() { guarantee(is_constantPool(), "vtable restored by this call"); }
701 private:
702 enum { _no_index_sentinel = -1, _possible_index_sentinel = -2 };
703 public:
705 // Resolve late bound constants.
706 oop resolve_constant_at(int index, TRAPS) {
707 constantPoolHandle h_this(THREAD, this);
708 return resolve_constant_at_impl(h_this, index, _no_index_sentinel, THREAD);
709 }
711 oop resolve_cached_constant_at(int cache_index, TRAPS) {
712 constantPoolHandle h_this(THREAD, this);
713 return resolve_constant_at_impl(h_this, _no_index_sentinel, cache_index, THREAD);
714 }
716 oop resolve_possibly_cached_constant_at(int pool_index, TRAPS) {
717 constantPoolHandle h_this(THREAD, this);
718 return resolve_constant_at_impl(h_this, pool_index, _possible_index_sentinel, THREAD);
719 }
721 oop resolve_bootstrap_specifier_at(int index, TRAPS) {
722 constantPoolHandle h_this(THREAD, this);
723 return resolve_bootstrap_specifier_at_impl(h_this, index, THREAD);
724 }
726 // Klass name matches name at offset
727 bool klass_name_at_matches(instanceKlassHandle k, int which);
729 // Sizing
730 int length() const { return _length; }
731 void set_length(int length) { _length = length; }
733 // Tells whether index is within bounds.
734 bool is_within_bounds(int index) const {
735 return 0 <= index && index < length();
736 }
738 // Sizing (in words)
739 static int header_size() { return sizeof(ConstantPool)/HeapWordSize; }
740 static int size(int length) { return align_object_size(header_size() + length); }
741 int size() const { return size(length()); }
742 #if INCLUDE_SERVICES
743 void collect_statistics(KlassSizeStats *sz) const;
744 #endif
746 friend class ClassFileParser;
747 friend class SystemDictionary;
749 // Used by compiler to prevent classloading.
750 static Method* method_at_if_loaded (constantPoolHandle this_oop, int which);
751 static bool has_appendix_at_if_loaded (constantPoolHandle this_oop, int which);
752 static oop appendix_at_if_loaded (constantPoolHandle this_oop, int which);
753 static bool has_method_type_at_if_loaded (constantPoolHandle this_oop, int which);
754 static oop method_type_at_if_loaded (constantPoolHandle this_oop, int which);
755 static Klass* klass_at_if_loaded (constantPoolHandle this_oop, int which);
756 static Klass* klass_ref_at_if_loaded (constantPoolHandle this_oop, int which);
758 // Routines currently used for annotations (only called by jvm.cpp) but which might be used in the
759 // future by other Java code. These take constant pool indices rather than
760 // constant pool cache indices as do the peer methods above.
761 Symbol* uncached_klass_ref_at_noresolve(int which);
762 Symbol* uncached_name_ref_at(int which) { return impl_name_ref_at(which, true); }
763 Symbol* uncached_signature_ref_at(int which) { return impl_signature_ref_at(which, true); }
764 int uncached_klass_ref_index_at(int which) { return impl_klass_ref_index_at(which, true); }
765 int uncached_name_and_type_ref_index_at(int which) { return impl_name_and_type_ref_index_at(which, true); }
767 // Sharing
768 int pre_resolve_shared_klasses(TRAPS);
770 // Debugging
771 const char* printable_name_at(int which) PRODUCT_RETURN0;
773 #ifdef ASSERT
774 enum { CPCACHE_INDEX_TAG = 0x10000 }; // helps keep CP cache indices distinct from CP indices
775 #else
776 enum { CPCACHE_INDEX_TAG = 0 }; // in product mode, this zero value is a no-op
777 #endif //ASSERT
779 static int decode_cpcache_index(int raw_index, bool invokedynamic_ok = false) {
780 if (invokedynamic_ok && is_invokedynamic_index(raw_index))
781 return decode_invokedynamic_index(raw_index);
782 else
783 return raw_index - CPCACHE_INDEX_TAG;
784 }
786 private:
788 void set_resolved_references(jobject s) { _resolved_references = s; }
789 Array<u2>* reference_map() const { return _reference_map; }
790 void set_reference_map(Array<u2>* o) { _reference_map = o; }
792 // patch JSR 292 resolved references after the class is linked.
793 void patch_resolved_references(GrowableArray<Handle>* cp_patches);
795 Symbol* impl_name_ref_at(int which, bool uncached);
796 Symbol* impl_signature_ref_at(int which, bool uncached);
797 int impl_klass_ref_index_at(int which, bool uncached);
798 int impl_name_and_type_ref_index_at(int which, bool uncached);
800 int remap_instruction_operand_from_cache(int operand); // operand must be biased by CPCACHE_INDEX_TAG
802 // Used while constructing constant pool (only by ClassFileParser)
803 jint klass_index_at(int which) {
804 assert(tag_at(which).is_klass_index(), "Corrupted constant pool");
805 return *int_at_addr(which);
806 }
808 jint string_index_at(int which) {
809 assert(tag_at(which).is_string_index(), "Corrupted constant pool");
810 return *int_at_addr(which);
811 }
813 // Performs the LinkResolver checks
814 static void verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle klass, TRAPS);
816 // Implementation of methods that needs an exposed 'this' pointer, in order to
817 // handle GC while executing the method
818 static Klass* klass_at_impl(constantPoolHandle this_oop, int which, TRAPS);
819 static oop string_at_impl(constantPoolHandle this_oop, int which, int obj_index, TRAPS);
821 // Resolve string constants (to prevent allocation during compilation)
822 static void resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS);
824 static oop resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS);
825 static void save_and_throw_exception(constantPoolHandle this_oop, int which, int tag_value, TRAPS);
826 static oop resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS);
828 public:
829 // Merging ConstantPool* support:
830 bool compare_entry_to(int index1, constantPoolHandle cp2, int index2, TRAPS);
831 void copy_cp_to(int start_i, int end_i, constantPoolHandle to_cp, int to_i, TRAPS) {
832 constantPoolHandle h_this(THREAD, this);
833 copy_cp_to_impl(h_this, start_i, end_i, to_cp, to_i, THREAD);
834 }
835 static void copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i, constantPoolHandle to_cp, int to_i, TRAPS);
836 static void copy_entry_to(constantPoolHandle from_cp, int from_i, constantPoolHandle to_cp, int to_i, TRAPS);
837 static void copy_operands(constantPoolHandle from_cp, constantPoolHandle to_cp, TRAPS);
838 int find_matching_entry(int pattern_i, constantPoolHandle search_cp, TRAPS);
839 int version() const { return _saved._version; }
840 void set_version(int version) { _saved._version = version; }
841 void increment_and_save_version(int version) {
842 _saved._version = version >= 0 ? (version + 1) : version; // keep overflow
843 }
845 void set_resolved_reference_length(int length) { _saved._resolved_reference_length = length; }
846 int resolved_reference_length() const { return _saved._resolved_reference_length; }
847 void set_lock(Monitor* lock) { _lock = lock; }
848 Monitor* lock() { return _lock; }
850 // Decrease ref counts of symbols that are in the constant pool
851 // when the holder class is unloaded
852 void unreference_symbols();
854 // Deallocate constant pool for RedefineClasses
855 void deallocate_contents(ClassLoaderData* loader_data);
856 void release_C_heap_structures();
858 // JVMTI accesss - GetConstantPool, RetransformClasses, ...
859 friend class JvmtiConstantPoolReconstituter;
861 private:
862 jint cpool_entry_size(jint idx);
863 jint hash_entries_to(SymbolHashMap *symmap, SymbolHashMap *classmap);
865 // Copy cpool bytes into byte array.
866 // Returns:
867 // int > 0, count of the raw cpool bytes that have been copied
868 // 0, OutOfMemory error
869 // -1, Internal error
870 int copy_cpool_bytes(int cpool_size,
871 SymbolHashMap* tbl,
872 unsigned char *bytes);
874 public:
875 // Verify
876 void verify_on(outputStream* st);
878 // Printing
879 void print_on(outputStream* st) const;
880 void print_value_on(outputStream* st) const;
881 void print_entry_on(int index, outputStream* st);
883 const char* internal_name() const { return "{constant pool}"; }
885 #ifndef PRODUCT
886 // Compile the world support
887 static void preload_and_initialize_all_classes(ConstantPool* constant_pool, TRAPS);
888 #endif
889 };
891 class SymbolHashMapEntry : public CHeapObj<mtSymbol> {
892 private:
893 unsigned int _hash; // 32-bit hash for item
894 SymbolHashMapEntry* _next; // Next element in the linked list for this bucket
895 Symbol* _symbol; // 1-st part of the mapping: symbol => value
896 u2 _value; // 2-nd part of the mapping: symbol => value
898 public:
899 unsigned int hash() const { return _hash; }
900 void set_hash(unsigned int hash) { _hash = hash; }
902 SymbolHashMapEntry* next() const { return _next; }
903 void set_next(SymbolHashMapEntry* next) { _next = next; }
905 Symbol* symbol() const { return _symbol; }
906 void set_symbol(Symbol* sym) { _symbol = sym; }
908 u2 value() const { return _value; }
909 void set_value(u2 value) { _value = value; }
911 SymbolHashMapEntry(unsigned int hash, Symbol* symbol, u2 value)
912 : _hash(hash), _symbol(symbol), _value(value), _next(NULL) {}
914 }; // End SymbolHashMapEntry class
917 class SymbolHashMapBucket : public CHeapObj<mtSymbol> {
919 private:
920 SymbolHashMapEntry* _entry;
922 public:
923 SymbolHashMapEntry* entry() const { return _entry; }
924 void set_entry(SymbolHashMapEntry* entry) { _entry = entry; }
925 void clear() { _entry = NULL; }
927 }; // End SymbolHashMapBucket class
930 class SymbolHashMap: public CHeapObj<mtSymbol> {
932 private:
933 // Default number of entries in the table
934 enum SymbolHashMap_Constants {
935 _Def_HashMap_Size = 256
936 };
938 int _table_size;
939 SymbolHashMapBucket* _buckets;
941 void initialize_table(int table_size) {
942 _table_size = table_size;
943 _buckets = NEW_C_HEAP_ARRAY(SymbolHashMapBucket, table_size, mtSymbol);
944 for (int index = 0; index < table_size; index++) {
945 _buckets[index].clear();
946 }
947 }
949 public:
951 int table_size() const { return _table_size; }
953 SymbolHashMap() { initialize_table(_Def_HashMap_Size); }
954 SymbolHashMap(int table_size) { initialize_table(table_size); }
956 // hash P(31) from Kernighan & Ritchie
957 static unsigned int compute_hash(const char* str, int len) {
958 unsigned int hash = 0;
959 while (len-- > 0) {
960 hash = 31*hash + (unsigned) *str;
961 str++;
962 }
963 return hash;
964 }
966 SymbolHashMapEntry* bucket(int i) {
967 return _buckets[i].entry();
968 }
970 void add_entry(Symbol* sym, u2 value);
971 SymbolHashMapEntry* find_entry(Symbol* sym);
973 u2 symbol_to_value(Symbol* sym) {
974 SymbolHashMapEntry *entry = find_entry(sym);
975 return (entry == NULL) ? 0 : entry->value();
976 }
978 ~SymbolHashMap() {
979 SymbolHashMapEntry* next;
980 for (int i = 0; i < _table_size; i++) {
981 for (SymbolHashMapEntry* cur = bucket(i); cur != NULL; cur = next) {
982 next = cur->next();
983 delete(cur);
984 }
985 }
986 delete _buckets;
987 }
988 }; // End SymbolHashMap class
990 #endif // SHARE_VM_OOPS_CONSTANTPOOLOOP_HPP