Sat, 07 Nov 2020 10:30:02 +0800
Added tag mips-jdk8u275-b01 for changeset d3b4d62f391f
1 /*
2 * Copyright (c) 1997, 2018, 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.
22 *
23 */
25 /*
26 * This file has been modified by Loongson Technology in 2015. These
27 * modifications are Copyright (c) 2015 Loongson Technology, and are made
28 * available on the same license terms set forth above.
29 */
31 #ifndef SHARE_VM_OOPS_CONSTANTPOOLOOP_HPP
32 #define SHARE_VM_OOPS_CONSTANTPOOLOOP_HPP
34 #include "oops/arrayOop.hpp"
35 #include "oops/cpCache.hpp"
36 #include "oops/objArrayOop.hpp"
37 #include "oops/symbol.hpp"
38 #include "oops/typeArrayOop.hpp"
39 #include "runtime/handles.hpp"
40 #include "utilities/constantTag.hpp"
41 #ifdef TARGET_ARCH_x86
42 # include "bytes_x86.hpp"
43 #endif
44 #ifdef TARGET_ARCH_sparc
45 # include "bytes_sparc.hpp"
46 #endif
47 #ifdef TARGET_ARCH_zero
48 # include "bytes_zero.hpp"
49 #endif
50 #ifdef TARGET_ARCH_arm
51 # include "bytes_arm.hpp"
52 #endif
53 #ifdef TARGET_ARCH_ppc
54 # include "bytes_ppc.hpp"
55 #endif
56 #ifdef TARGET_ARCH_mips
57 # include "bytes_mips.hpp"
58 #endif
61 // A constantPool is an array containing class constants as described in the
62 // class file.
63 //
64 // Most of the constant pool entries are written during class parsing, which
65 // is safe. For klass types, the constant pool entry is
66 // modified when the entry is resolved. If a klass constant pool
67 // entry is read without a lock, only the resolved state guarantees that
68 // the entry in the constant pool is a klass object and not a Symbol*.
70 class SymbolHashMap;
72 class CPSlot VALUE_OBJ_CLASS_SPEC {
73 intptr_t _ptr;
74 public:
75 CPSlot(intptr_t ptr): _ptr(ptr) {}
76 CPSlot(Klass* ptr): _ptr((intptr_t)ptr) {}
77 CPSlot(Symbol* ptr): _ptr((intptr_t)ptr | 1) {}
79 intptr_t value() { return _ptr; }
80 bool is_resolved() { return (_ptr & 1) == 0; }
81 bool is_unresolved() { return (_ptr & 1) == 1; }
83 Symbol* get_symbol() {
84 assert(is_unresolved(), "bad call");
85 return (Symbol*)(_ptr & ~1);
86 }
87 Klass* get_klass() {
88 assert(is_resolved(), "bad call");
89 return (Klass*)_ptr;
90 }
91 };
93 class KlassSizeStats;
94 class ConstantPool : public Metadata {
95 friend class VMStructs;
96 friend class BytecodeInterpreter; // Directly extracts an oop in the pool for fast instanceof/checkcast
97 friend class Universe; // For null constructor
98 private:
99 Array<u1>* _tags; // the tag array describing the constant pool's contents
100 ConstantPoolCache* _cache; // the cache holding interpreter runtime information
101 InstanceKlass* _pool_holder; // the corresponding class
102 Array<u2>* _operands; // for variable-sized (InvokeDynamic) nodes, usually empty
104 // Array of resolved objects from the constant pool and map from resolved
105 // object index to original constant pool index
106 jobject _resolved_references;
107 Array<u2>* _reference_map;
109 enum {
110 _has_preresolution = 1, // Flags
111 _on_stack = 2
112 };
114 int _flags; // old fashioned bit twiddling
115 int _length; // number of elements in the array
117 union {
118 // set for CDS to restore resolved references
119 int _resolved_reference_length;
120 // keeps version number for redefined classes (used in backtrace)
121 int _version;
122 } _saved;
124 Monitor* _lock;
126 void set_tags(Array<u1>* tags) { _tags = tags; }
127 void tag_at_put(int which, jbyte t) { tags()->at_put(which, t); }
128 void release_tag_at_put(int which, jbyte t) { tags()->release_at_put(which, t); }
130 void set_operands(Array<u2>* operands) { _operands = operands; }
132 int flags() const { return _flags; }
133 void set_flags(int f) { _flags = f; }
135 private:
136 intptr_t* base() const { return (intptr_t*) (((char*) this) + sizeof(ConstantPool)); }
138 CPSlot slot_at(int which) const {
139 assert(is_within_bounds(which), "index out of bounds");
140 // Uses volatile because the klass slot changes without a lock.
141 volatile intptr_t adr = (intptr_t)OrderAccess::load_ptr_acquire(obj_at_addr_raw(which));
142 assert(adr != 0 || which == 0, "cp entry for klass should not be zero");
143 return CPSlot(adr);
144 }
146 void slot_at_put(int which, CPSlot s) const {
147 assert(is_within_bounds(which), "index out of bounds");
148 assert(s.value() != 0, "Caught something");
149 *(intptr_t*)&base()[which] = s.value();
150 }
151 intptr_t* obj_at_addr_raw(int which) const {
152 assert(is_within_bounds(which), "index out of bounds");
153 return (intptr_t*) &base()[which];
154 }
156 jint* int_at_addr(int which) const {
157 assert(is_within_bounds(which), "index out of bounds");
158 return (jint*) &base()[which];
159 }
161 jlong* long_at_addr(int which) const {
162 assert(is_within_bounds(which), "index out of bounds");
163 return (jlong*) &base()[which];
164 }
166 jfloat* float_at_addr(int which) const {
167 assert(is_within_bounds(which), "index out of bounds");
168 return (jfloat*) &base()[which];
169 }
171 jdouble* double_at_addr(int which) const {
172 assert(is_within_bounds(which), "index out of bounds");
173 return (jdouble*) &base()[which];
174 }
176 ConstantPool(Array<u1>* tags);
177 ConstantPool() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
178 public:
179 static ConstantPool* allocate(ClassLoaderData* loader_data, int length, TRAPS);
181 bool is_constantPool() const volatile { return true; }
183 Array<u1>* tags() const { return _tags; }
184 Array<u2>* operands() const { return _operands; }
186 bool has_preresolution() const { return (_flags & _has_preresolution) != 0; }
187 void set_has_preresolution() { _flags |= _has_preresolution; }
189 // Redefine classes support. If a method refering to this constant pool
190 // is on the executing stack, or as a handle in vm code, this constant pool
191 // can't be removed from the set of previous versions saved in the instance
192 // class.
193 bool on_stack() const { return (_flags &_on_stack) != 0; }
194 void set_on_stack(const bool value);
196 // Klass holding pool
197 InstanceKlass* pool_holder() const { return _pool_holder; }
198 void set_pool_holder(InstanceKlass* k) { _pool_holder = k; }
199 InstanceKlass** pool_holder_addr() { return &_pool_holder; }
201 // Interpreter runtime support
202 ConstantPoolCache* cache() const { return _cache; }
203 void set_cache(ConstantPoolCache* cache){ _cache = cache; }
205 // Create object cache in the constant pool
206 void initialize_resolved_references(ClassLoaderData* loader_data,
207 intStack reference_map,
208 int constant_pool_map_length,
209 TRAPS);
211 // resolved strings, methodHandles and callsite objects from the constant pool
212 objArrayOop resolved_references() const;
213 objArrayOop resolved_references_or_null() const;
214 // mapping resolved object array indexes to cp indexes and back.
215 int object_to_cp_index(int index) { return _reference_map->at(index); }
216 int cp_to_object_index(int index);
218 // Invokedynamic indexes.
219 // They must look completely different from normal indexes.
220 // The main reason is that byte swapping is sometimes done on normal indexes.
221 // Finally, it is helpful for debugging to tell the two apart.
222 static bool is_invokedynamic_index(int i) { return (i < 0); }
223 static int decode_invokedynamic_index(int i) { assert(is_invokedynamic_index(i), ""); return ~i; }
224 static int encode_invokedynamic_index(int i) { assert(!is_invokedynamic_index(i), ""); return ~i; }
227 // The invokedynamic points at a CP cache entry. This entry points back
228 // at the original CP entry (CONSTANT_InvokeDynamic) and also (via f2) at an entry
229 // in the resolved_references array (which provides the appendix argument).
230 int invokedynamic_cp_cache_index(int index) const {
231 assert (is_invokedynamic_index(index), "should be a invokedynamic index");
232 int cache_index = decode_invokedynamic_index(index);
233 return cache_index;
234 }
235 ConstantPoolCacheEntry* invokedynamic_cp_cache_entry_at(int index) const {
236 // decode index that invokedynamic points to.
237 int cp_cache_index = invokedynamic_cp_cache_index(index);
238 return cache()->entry_at(cp_cache_index);
239 }
241 // Assembly code support
242 static int tags_offset_in_bytes() { return offset_of(ConstantPool, _tags); }
243 static int cache_offset_in_bytes() { return offset_of(ConstantPool, _cache); }
244 static int pool_holder_offset_in_bytes() { return offset_of(ConstantPool, _pool_holder); }
245 static int resolved_references_offset_in_bytes() { return offset_of(ConstantPool, _resolved_references); }
247 // Storing constants
249 void klass_at_put(int which, Klass* k) {
250 assert(k != NULL, "resolved class shouldn't be null");
251 assert(is_within_bounds(which), "index out of bounds");
252 OrderAccess::release_store_ptr((Klass* volatile *)obj_at_addr_raw(which), k);
253 // The interpreter assumes when the tag is stored, the klass is resolved
254 // and the Klass* is a klass rather than a Symbol*, so we need
255 // hardware store ordering here.
256 release_tag_at_put(which, JVM_CONSTANT_Class);
257 }
259 // For temporary use while constructing constant pool
260 void klass_index_at_put(int which, int name_index) {
261 tag_at_put(which, JVM_CONSTANT_ClassIndex);
262 *int_at_addr(which) = name_index;
263 }
265 // Temporary until actual use
266 void unresolved_klass_at_put(int which, Symbol* s) {
267 release_tag_at_put(which, JVM_CONSTANT_UnresolvedClass);
268 slot_at_put(which, s);
269 }
271 void method_handle_index_at_put(int which, int ref_kind, int ref_index) {
272 tag_at_put(which, JVM_CONSTANT_MethodHandle);
273 *int_at_addr(which) = ((jint) ref_index<<16) | ref_kind;
274 }
276 void method_type_index_at_put(int which, int ref_index) {
277 tag_at_put(which, JVM_CONSTANT_MethodType);
278 *int_at_addr(which) = ref_index;
279 }
281 void invoke_dynamic_at_put(int which, int bootstrap_specifier_index, int name_and_type_index) {
282 tag_at_put(which, JVM_CONSTANT_InvokeDynamic);
283 *int_at_addr(which) = ((jint) name_and_type_index<<16) | bootstrap_specifier_index;
284 }
286 void unresolved_string_at_put(int which, Symbol* s) {
287 release_tag_at_put(which, JVM_CONSTANT_String);
288 *symbol_at_addr(which) = s;
289 }
291 void int_at_put(int which, jint i) {
292 tag_at_put(which, JVM_CONSTANT_Integer);
293 *int_at_addr(which) = i;
294 }
296 void long_at_put(int which, jlong l) {
297 tag_at_put(which, JVM_CONSTANT_Long);
298 // *long_at_addr(which) = l;
299 Bytes::put_native_u8((address)long_at_addr(which), *((u8*) &l));
300 }
302 void float_at_put(int which, jfloat f) {
303 tag_at_put(which, JVM_CONSTANT_Float);
304 *float_at_addr(which) = f;
305 }
307 void double_at_put(int which, jdouble d) {
308 tag_at_put(which, JVM_CONSTANT_Double);
309 // *double_at_addr(which) = d;
310 // u8 temp = *(u8*) &d;
311 Bytes::put_native_u8((address) double_at_addr(which), *((u8*) &d));
312 }
314 Symbol** symbol_at_addr(int which) const {
315 assert(is_within_bounds(which), "index out of bounds");
316 return (Symbol**) &base()[which];
317 }
319 void symbol_at_put(int which, Symbol* s) {
320 assert(s->refcount() != 0, "should have nonzero refcount");
321 tag_at_put(which, JVM_CONSTANT_Utf8);
322 *symbol_at_addr(which) = s;
323 }
325 void string_at_put(int which, int obj_index, oop str) {
326 resolved_references()->obj_at_put(obj_index, str);
327 }
329 // For temporary use while constructing constant pool
330 void string_index_at_put(int which, int string_index) {
331 tag_at_put(which, JVM_CONSTANT_StringIndex);
332 *int_at_addr(which) = string_index;
333 }
335 void field_at_put(int which, int class_index, int name_and_type_index) {
336 tag_at_put(which, JVM_CONSTANT_Fieldref);
337 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index;
338 }
340 void method_at_put(int which, int class_index, int name_and_type_index) {
341 tag_at_put(which, JVM_CONSTANT_Methodref);
342 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index;
343 }
345 void interface_method_at_put(int which, int class_index, int name_and_type_index) {
346 tag_at_put(which, JVM_CONSTANT_InterfaceMethodref);
347 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; // Not so nice
348 }
350 void name_and_type_at_put(int which, int name_index, int signature_index) {
351 tag_at_put(which, JVM_CONSTANT_NameAndType);
352 *int_at_addr(which) = ((jint) signature_index<<16) | name_index; // Not so nice
353 }
355 // Tag query
357 constantTag tag_at(int which) const { return (constantTag)tags()->at_acquire(which); }
359 // Fetching constants
361 Klass* klass_at(int which, TRAPS) {
362 constantPoolHandle h_this(THREAD, this);
363 return klass_at_impl(h_this, which, CHECK_NULL);
364 }
366 Symbol* klass_name_at(int which) const; // Returns the name, w/o resolving.
368 Klass* resolved_klass_at(int which) const { // Used by Compiler
369 guarantee(tag_at(which).is_klass(), "Corrupted constant pool");
370 // Must do an acquire here in case another thread resolved the klass
371 // behind our back, lest we later load stale values thru the oop.
372 return CPSlot((Klass*)OrderAccess::load_ptr_acquire(obj_at_addr_raw(which))).get_klass();
373 }
375 // This method should only be used with a cpool lock or during parsing or gc
376 Symbol* unresolved_klass_at(int which) { // Temporary until actual use
377 Symbol* s = CPSlot((Symbol*)OrderAccess::load_ptr_acquire(obj_at_addr_raw(which))).get_symbol();
378 // check that the klass is still unresolved.
379 assert(tag_at(which).is_unresolved_klass(), "Corrupted constant pool");
380 return s;
381 }
383 // RedefineClasses() API support:
384 Symbol* klass_at_noresolve(int which) { return klass_name_at(which); }
386 jint int_at(int which) {
387 assert(tag_at(which).is_int(), "Corrupted constant pool");
388 return *int_at_addr(which);
389 }
391 jlong long_at(int which) {
392 assert(tag_at(which).is_long(), "Corrupted constant pool");
393 // return *long_at_addr(which);
394 u8 tmp = Bytes::get_native_u8((address)&base()[which]);
395 return *((jlong*)&tmp);
396 }
398 jfloat float_at(int which) {
399 assert(tag_at(which).is_float(), "Corrupted constant pool");
400 return *float_at_addr(which);
401 }
403 jdouble double_at(int which) {
404 assert(tag_at(which).is_double(), "Corrupted constant pool");
405 u8 tmp = Bytes::get_native_u8((address)&base()[which]);
406 return *((jdouble*)&tmp);
407 }
409 Symbol* symbol_at(int which) {
410 assert(tag_at(which).is_utf8(), "Corrupted constant pool");
411 return *symbol_at_addr(which);
412 }
414 oop string_at(int which, int obj_index, TRAPS) {
415 constantPoolHandle h_this(THREAD, this);
416 return string_at_impl(h_this, which, obj_index, THREAD);
417 }
418 oop string_at(int which, TRAPS) {
419 int obj_index = cp_to_object_index(which);
420 return string_at(which, obj_index, THREAD);
421 }
423 // Version that can be used before string oop array is created.
424 oop uncached_string_at(int which, TRAPS);
426 // A "pseudo-string" is an non-string oop that has found is way into
427 // a String entry.
428 // Under EnableInvokeDynamic this can happen if the user patches a live
429 // object into a CONSTANT_String entry of an anonymous class.
430 // Method oops internally created for method handles may also
431 // use pseudo-strings to link themselves to related metaobjects.
433 bool is_pseudo_string_at(int which) {
434 // A pseudo string is a string that doesn't have a symbol in the cpSlot
435 return unresolved_string_at(which) == NULL;
436 }
438 oop pseudo_string_at(int which, int obj_index) {
439 assert(tag_at(which).is_string(), "Corrupted constant pool");
440 assert(unresolved_string_at(which) == NULL, "shouldn't have symbol");
441 oop s = resolved_references()->obj_at(obj_index);
442 return s;
443 }
445 oop pseudo_string_at(int which) {
446 assert(tag_at(which).is_string(), "Corrupted constant pool");
447 assert(unresolved_string_at(which) == NULL, "shouldn't have symbol");
448 int obj_index = cp_to_object_index(which);
449 oop s = resolved_references()->obj_at(obj_index);
450 return s;
451 }
453 void pseudo_string_at_put(int which, int obj_index, oop x) {
454 assert(EnableInvokeDynamic, "");
455 assert(tag_at(which).is_string(), "Corrupted constant pool");
456 unresolved_string_at_put(which, NULL); // indicates patched string
457 string_at_put(which, obj_index, x); // this works just fine
458 }
460 // only called when we are sure a string entry is already resolved (via an
461 // earlier string_at call.
462 oop resolved_string_at(int which) {
463 assert(tag_at(which).is_string(), "Corrupted constant pool");
464 // Must do an acquire here in case another thread resolved the klass
465 // behind our back, lest we later load stale values thru the oop.
466 // we might want a volatile_obj_at in ObjArrayKlass.
467 int obj_index = cp_to_object_index(which);
468 return resolved_references()->obj_at(obj_index);
469 }
471 Symbol* unresolved_string_at(int which) {
472 assert(tag_at(which).is_string(), "Corrupted constant pool");
473 Symbol* s = *symbol_at_addr(which);
474 return s;
475 }
477 // Returns an UTF8 for a CONSTANT_String entry at a given index.
478 // UTF8 char* representation was chosen to avoid conversion of
479 // java_lang_Strings at resolved entries into Symbol*s
480 // or vice versa.
481 // Caller is responsible for checking for pseudo-strings.
482 char* string_at_noresolve(int which);
484 jint name_and_type_at(int which) {
485 assert(tag_at(which).is_name_and_type(), "Corrupted constant pool");
486 return *int_at_addr(which);
487 }
489 private:
490 int method_handle_ref_kind_at(int which, bool error_ok) {
491 assert(tag_at(which).is_method_handle() ||
492 (error_ok && tag_at(which).is_method_handle_in_error()), "Corrupted constant pool");
493 return extract_low_short_from_int(*int_at_addr(which)); // mask out unwanted ref_index bits
494 }
495 int method_handle_index_at(int which, bool error_ok) {
496 assert(tag_at(which).is_method_handle() ||
497 (error_ok && tag_at(which).is_method_handle_in_error()), "Corrupted constant pool");
498 return extract_high_short_from_int(*int_at_addr(which)); // shift out unwanted ref_kind bits
499 }
500 int method_type_index_at(int which, bool error_ok) {
501 assert(tag_at(which).is_method_type() ||
502 (error_ok && tag_at(which).is_method_type_in_error()), "Corrupted constant pool");
503 return *int_at_addr(which);
504 }
505 public:
506 int method_handle_ref_kind_at(int which) {
507 return method_handle_ref_kind_at(which, false);
508 }
509 int method_handle_ref_kind_at_error_ok(int which) {
510 return method_handle_ref_kind_at(which, true);
511 }
512 int method_handle_index_at(int which) {
513 return method_handle_index_at(which, false);
514 }
515 int method_handle_index_at_error_ok(int which) {
516 return method_handle_index_at(which, true);
517 }
518 int method_type_index_at(int which) {
519 return method_type_index_at(which, false);
520 }
521 int method_type_index_at_error_ok(int which) {
522 return method_type_index_at(which, true);
523 }
525 // Derived queries:
526 Symbol* method_handle_name_ref_at(int which) {
527 int member = method_handle_index_at(which);
528 return impl_name_ref_at(member, true);
529 }
530 Symbol* method_handle_signature_ref_at(int which) {
531 int member = method_handle_index_at(which);
532 return impl_signature_ref_at(member, true);
533 }
534 int method_handle_klass_index_at(int which) {
535 int member = method_handle_index_at(which);
536 return impl_klass_ref_index_at(member, true);
537 }
538 Symbol* method_type_signature_at(int which) {
539 int sym = method_type_index_at(which);
540 return symbol_at(sym);
541 }
543 int invoke_dynamic_name_and_type_ref_index_at(int which) {
544 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool");
545 return extract_high_short_from_int(*int_at_addr(which));
546 }
547 int invoke_dynamic_bootstrap_specifier_index(int which) {
548 assert(tag_at(which).value() == JVM_CONSTANT_InvokeDynamic, "Corrupted constant pool");
549 return extract_low_short_from_int(*int_at_addr(which));
550 }
551 int invoke_dynamic_operand_base(int which) {
552 int bootstrap_specifier_index = invoke_dynamic_bootstrap_specifier_index(which);
553 return operand_offset_at(operands(), bootstrap_specifier_index);
554 }
555 // The first part of the operands array consists of an index into the second part.
556 // Extract a 32-bit index value from the first part.
557 static int operand_offset_at(Array<u2>* operands, int bootstrap_specifier_index) {
558 int n = (bootstrap_specifier_index * 2);
559 assert(n >= 0 && n+2 <= operands->length(), "oob");
560 // The first 32-bit index points to the beginning of the second part
561 // of the operands array. Make sure this index is in the first part.
562 DEBUG_ONLY(int second_part = build_int_from_shorts(operands->at(0),
563 operands->at(1)));
564 assert(second_part == 0 || n+2 <= second_part, "oob (2)");
565 int offset = build_int_from_shorts(operands->at(n+0),
566 operands->at(n+1));
567 // The offset itself must point into the second part of the array.
568 assert(offset == 0 || offset >= second_part && offset <= operands->length(), "oob (3)");
569 return offset;
570 }
571 static void operand_offset_at_put(Array<u2>* operands, int bootstrap_specifier_index, int offset) {
572 int n = bootstrap_specifier_index * 2;
573 assert(n >= 0 && n+2 <= operands->length(), "oob");
574 operands->at_put(n+0, extract_low_short_from_int(offset));
575 operands->at_put(n+1, extract_high_short_from_int(offset));
576 }
577 static int operand_array_length(Array<u2>* operands) {
578 if (operands == NULL || operands->length() == 0) return 0;
579 int second_part = operand_offset_at(operands, 0);
580 return (second_part / 2);
581 }
583 #ifdef ASSERT
584 // operand tuples fit together exactly, end to end
585 static int operand_limit_at(Array<u2>* operands, int bootstrap_specifier_index) {
586 int nextidx = bootstrap_specifier_index + 1;
587 if (nextidx == operand_array_length(operands))
588 return operands->length();
589 else
590 return operand_offset_at(operands, nextidx);
591 }
592 int invoke_dynamic_operand_limit(int which) {
593 int bootstrap_specifier_index = invoke_dynamic_bootstrap_specifier_index(which);
594 return operand_limit_at(operands(), bootstrap_specifier_index);
595 }
596 #endif //ASSERT
598 // layout of InvokeDynamic bootstrap method specifier (in second part of operands array):
599 enum {
600 _indy_bsm_offset = 0, // CONSTANT_MethodHandle bsm
601 _indy_argc_offset = 1, // u2 argc
602 _indy_argv_offset = 2 // u2 argv[argc]
603 };
605 // These functions are used in RedefineClasses for CP merge
607 int operand_offset_at(int bootstrap_specifier_index) {
608 assert(0 <= bootstrap_specifier_index &&
609 bootstrap_specifier_index < operand_array_length(operands()),
610 "Corrupted CP operands");
611 return operand_offset_at(operands(), bootstrap_specifier_index);
612 }
613 int operand_bootstrap_method_ref_index_at(int bootstrap_specifier_index) {
614 int offset = operand_offset_at(bootstrap_specifier_index);
615 return operands()->at(offset + _indy_bsm_offset);
616 }
617 int operand_argument_count_at(int bootstrap_specifier_index) {
618 int offset = operand_offset_at(bootstrap_specifier_index);
619 int argc = operands()->at(offset + _indy_argc_offset);
620 return argc;
621 }
622 int operand_argument_index_at(int bootstrap_specifier_index, int j) {
623 int offset = operand_offset_at(bootstrap_specifier_index);
624 return operands()->at(offset + _indy_argv_offset + j);
625 }
626 int operand_next_offset_at(int bootstrap_specifier_index) {
627 int offset = operand_offset_at(bootstrap_specifier_index) + _indy_argv_offset
628 + operand_argument_count_at(bootstrap_specifier_index);
629 return offset;
630 }
631 // Compare a bootsrap specifier in the operands arrays
632 bool compare_operand_to(int bootstrap_specifier_index1, constantPoolHandle cp2,
633 int bootstrap_specifier_index2, TRAPS);
634 // Find a bootsrap specifier in the operands array
635 int find_matching_operand(int bootstrap_specifier_index, constantPoolHandle search_cp,
636 int operands_cur_len, TRAPS);
637 // Resize the operands array with delta_len and delta_size
638 void resize_operands(int delta_len, int delta_size, TRAPS);
639 // Extend the operands array with the length and size of the ext_cp operands
640 void extend_operands(constantPoolHandle ext_cp, TRAPS);
641 // Shrink the operands array to a smaller array with new_len length
642 void shrink_operands(int new_len, TRAPS);
645 int invoke_dynamic_bootstrap_method_ref_index_at(int which) {
646 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool");
647 int op_base = invoke_dynamic_operand_base(which);
648 return operands()->at(op_base + _indy_bsm_offset);
649 }
650 int invoke_dynamic_argument_count_at(int which) {
651 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool");
652 int op_base = invoke_dynamic_operand_base(which);
653 int argc = operands()->at(op_base + _indy_argc_offset);
654 DEBUG_ONLY(int end_offset = op_base + _indy_argv_offset + argc;
655 int next_offset = invoke_dynamic_operand_limit(which));
656 assert(end_offset == next_offset, "matched ending");
657 return argc;
658 }
659 int invoke_dynamic_argument_index_at(int which, int j) {
660 int op_base = invoke_dynamic_operand_base(which);
661 DEBUG_ONLY(int argc = operands()->at(op_base + _indy_argc_offset));
662 assert((uint)j < (uint)argc, "oob");
663 return operands()->at(op_base + _indy_argv_offset + j);
664 }
666 // The following methods (name/signature/klass_ref_at, klass_ref_at_noresolve,
667 // name_and_type_ref_index_at) all expect to be passed indices obtained
668 // directly from the bytecode.
669 // If the indices are meant to refer to fields or methods, they are
670 // actually rewritten constant pool cache indices.
671 // The routine remap_instruction_operand_from_cache manages the adjustment
672 // of these values back to constant pool indices.
674 // There are also "uncached" versions which do not adjust the operand index; see below.
676 // FIXME: Consider renaming these with a prefix "cached_" to make the distinction clear.
677 // In a few cases (the verifier) there are uses before a cpcache has been built,
678 // which are handled by a dynamic check in remap_instruction_operand_from_cache.
679 // FIXME: Remove the dynamic check, and adjust all callers to specify the correct mode.
681 // Lookup for entries consisting of (klass_index, name_and_type index)
682 Klass* klass_ref_at(int which, TRAPS);
683 Symbol* klass_ref_at_noresolve(int which);
684 Symbol* name_ref_at(int which) { return impl_name_ref_at(which, false); }
685 Symbol* signature_ref_at(int which) { return impl_signature_ref_at(which, false); }
687 int klass_ref_index_at(int which) { return impl_klass_ref_index_at(which, false); }
688 int name_and_type_ref_index_at(int which) { return impl_name_and_type_ref_index_at(which, false); }
690 // Lookup for entries consisting of (name_index, signature_index)
691 int name_ref_index_at(int which_nt); // == low-order jshort of name_and_type_at(which_nt)
692 int signature_ref_index_at(int which_nt); // == high-order jshort of name_and_type_at(which_nt)
694 BasicType basic_type_for_signature_at(int which);
696 // Resolve string constants (to prevent allocation during compilation)
697 void resolve_string_constants(TRAPS) {
698 constantPoolHandle h_this(THREAD, this);
699 resolve_string_constants_impl(h_this, CHECK);
700 }
702 // CDS support
703 void remove_unshareable_info();
704 void restore_unshareable_info(TRAPS);
705 bool resolve_class_constants(TRAPS);
706 // The ConstantPool vtable is restored by this call when the ConstantPool is
707 // in the shared archive. See patch_klass_vtables() in metaspaceShared.cpp for
708 // all the gory details. SA, dtrace and pstack helpers distinguish metadata
709 // by their vtable.
710 void restore_vtable() { guarantee(is_constantPool(), "vtable restored by this call"); }
712 private:
713 enum { _no_index_sentinel = -1, _possible_index_sentinel = -2 };
714 public:
716 // Resolve late bound constants.
717 oop resolve_constant_at(int index, TRAPS) {
718 constantPoolHandle h_this(THREAD, this);
719 return resolve_constant_at_impl(h_this, index, _no_index_sentinel, THREAD);
720 }
722 oop resolve_cached_constant_at(int cache_index, TRAPS) {
723 constantPoolHandle h_this(THREAD, this);
724 return resolve_constant_at_impl(h_this, _no_index_sentinel, cache_index, THREAD);
725 }
727 oop resolve_possibly_cached_constant_at(int pool_index, TRAPS) {
728 constantPoolHandle h_this(THREAD, this);
729 return resolve_constant_at_impl(h_this, pool_index, _possible_index_sentinel, THREAD);
730 }
732 oop resolve_bootstrap_specifier_at(int index, TRAPS) {
733 constantPoolHandle h_this(THREAD, this);
734 return resolve_bootstrap_specifier_at_impl(h_this, index, THREAD);
735 }
737 // Klass name matches name at offset
738 bool klass_name_at_matches(instanceKlassHandle k, int which);
740 // Sizing
741 int length() const { return _length; }
742 void set_length(int length) { _length = length; }
744 // Tells whether index is within bounds.
745 bool is_within_bounds(int index) const {
746 return 0 <= index && index < length();
747 }
749 // Sizing (in words)
750 static int header_size() { return sizeof(ConstantPool)/HeapWordSize; }
751 static int size(int length) { return align_object_size(header_size() + length); }
752 int size() const { return size(length()); }
753 #if INCLUDE_SERVICES
754 void collect_statistics(KlassSizeStats *sz) const;
755 #endif
757 friend class ClassFileParser;
758 friend class SystemDictionary;
760 // Used by compiler to prevent classloading.
761 static Method* method_at_if_loaded (constantPoolHandle this_oop, int which);
762 static bool has_appendix_at_if_loaded (constantPoolHandle this_oop, int which);
763 static oop appendix_at_if_loaded (constantPoolHandle this_oop, int which);
764 static bool has_method_type_at_if_loaded (constantPoolHandle this_oop, int which);
765 static oop method_type_at_if_loaded (constantPoolHandle this_oop, int which);
766 static Klass* klass_at_if_loaded (constantPoolHandle this_oop, int which);
767 static Klass* klass_ref_at_if_loaded (constantPoolHandle this_oop, int which);
769 // Routines currently used for annotations (only called by jvm.cpp) but which might be used in the
770 // future by other Java code. These take constant pool indices rather than
771 // constant pool cache indices as do the peer methods above.
772 Symbol* uncached_klass_ref_at_noresolve(int which);
773 Symbol* uncached_name_ref_at(int which) { return impl_name_ref_at(which, true); }
774 Symbol* uncached_signature_ref_at(int which) { return impl_signature_ref_at(which, true); }
775 int uncached_klass_ref_index_at(int which) { return impl_klass_ref_index_at(which, true); }
776 int uncached_name_and_type_ref_index_at(int which) { return impl_name_and_type_ref_index_at(which, true); }
778 // Sharing
779 int pre_resolve_shared_klasses(TRAPS);
781 // Debugging
782 const char* printable_name_at(int which) PRODUCT_RETURN0;
784 #ifdef ASSERT
785 enum { CPCACHE_INDEX_TAG = 0x10000 }; // helps keep CP cache indices distinct from CP indices
786 #else
787 enum { CPCACHE_INDEX_TAG = 0 }; // in product mode, this zero value is a no-op
788 #endif //ASSERT
790 static int decode_cpcache_index(int raw_index, bool invokedynamic_ok = false) {
791 if (invokedynamic_ok && is_invokedynamic_index(raw_index))
792 return decode_invokedynamic_index(raw_index);
793 else
794 return raw_index - CPCACHE_INDEX_TAG;
795 }
797 private:
799 void set_resolved_references(jobject s) { _resolved_references = s; }
800 Array<u2>* reference_map() const { return _reference_map; }
801 void set_reference_map(Array<u2>* o) { _reference_map = o; }
803 // patch JSR 292 resolved references after the class is linked.
804 void patch_resolved_references(GrowableArray<Handle>* cp_patches);
806 Symbol* impl_name_ref_at(int which, bool uncached);
807 Symbol* impl_signature_ref_at(int which, bool uncached);
808 int impl_klass_ref_index_at(int which, bool uncached);
809 int impl_name_and_type_ref_index_at(int which, bool uncached);
811 int remap_instruction_operand_from_cache(int operand); // operand must be biased by CPCACHE_INDEX_TAG
813 // Used while constructing constant pool (only by ClassFileParser)
814 jint klass_index_at(int which) {
815 assert(tag_at(which).is_klass_index(), "Corrupted constant pool");
816 return *int_at_addr(which);
817 }
819 jint string_index_at(int which) {
820 assert(tag_at(which).is_string_index(), "Corrupted constant pool");
821 return *int_at_addr(which);
822 }
824 // Performs the LinkResolver checks
825 static void verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle klass, TRAPS);
827 // Implementation of methods that needs an exposed 'this' pointer, in order to
828 // handle GC while executing the method
829 static Klass* klass_at_impl(constantPoolHandle this_oop, int which, TRAPS);
830 static oop string_at_impl(constantPoolHandle this_oop, int which, int obj_index, TRAPS);
832 // Resolve string constants (to prevent allocation during compilation)
833 static void resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS);
835 static oop resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS);
836 static oop resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS);
838 // Exception handling
839 static void throw_resolution_error(constantPoolHandle this_oop, int which, TRAPS);
840 static Symbol* exception_message(constantPoolHandle this_oop, int which, constantTag tag, oop pending_exception);
841 static void save_and_throw_exception(constantPoolHandle this_oop, int which, constantTag tag, TRAPS);
843 public:
844 // Merging ConstantPool* support:
845 bool compare_entry_to(int index1, constantPoolHandle cp2, int index2, TRAPS);
846 void copy_cp_to(int start_i, int end_i, constantPoolHandle to_cp, int to_i, TRAPS) {
847 constantPoolHandle h_this(THREAD, this);
848 copy_cp_to_impl(h_this, start_i, end_i, to_cp, to_i, THREAD);
849 }
850 static void copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i, constantPoolHandle to_cp, int to_i, TRAPS);
851 static void copy_entry_to(constantPoolHandle from_cp, int from_i, constantPoolHandle to_cp, int to_i, TRAPS);
852 static void copy_operands(constantPoolHandle from_cp, constantPoolHandle to_cp, TRAPS);
853 int find_matching_entry(int pattern_i, constantPoolHandle search_cp, TRAPS);
854 int version() const { return _saved._version; }
855 void set_version(int version) { _saved._version = version; }
856 void increment_and_save_version(int version) {
857 _saved._version = version >= 0 ? (version + 1) : version; // keep overflow
858 }
860 void set_resolved_reference_length(int length) { _saved._resolved_reference_length = length; }
861 int resolved_reference_length() const { return _saved._resolved_reference_length; }
862 void set_lock(Monitor* lock) { _lock = lock; }
863 Monitor* lock() { return _lock; }
865 // Decrease ref counts of symbols that are in the constant pool
866 // when the holder class is unloaded
867 void unreference_symbols();
869 // Deallocate constant pool for RedefineClasses
870 void deallocate_contents(ClassLoaderData* loader_data);
871 void release_C_heap_structures();
873 // JVMTI accesss - GetConstantPool, RetransformClasses, ...
874 friend class JvmtiConstantPoolReconstituter;
876 private:
877 jint cpool_entry_size(jint idx);
878 jint hash_entries_to(SymbolHashMap *symmap, SymbolHashMap *classmap);
880 // Copy cpool bytes into byte array.
881 // Returns:
882 // int > 0, count of the raw cpool bytes that have been copied
883 // 0, OutOfMemory error
884 // -1, Internal error
885 int copy_cpool_bytes(int cpool_size,
886 SymbolHashMap* tbl,
887 unsigned char *bytes);
889 public:
890 // Verify
891 void verify_on(outputStream* st);
893 // Printing
894 void print_on(outputStream* st) const;
895 void print_value_on(outputStream* st) const;
896 void print_entry_on(int index, outputStream* st);
898 const char* internal_name() const { return "{constant pool}"; }
900 #ifndef PRODUCT
901 // Compile the world support
902 static void preload_and_initialize_all_classes(ConstantPool* constant_pool, TRAPS);
903 #endif
904 };
906 class SymbolHashMapEntry : public CHeapObj<mtSymbol> {
907 private:
908 unsigned int _hash; // 32-bit hash for item
909 SymbolHashMapEntry* _next; // Next element in the linked list for this bucket
910 Symbol* _symbol; // 1-st part of the mapping: symbol => value
911 u2 _value; // 2-nd part of the mapping: symbol => value
913 public:
914 unsigned int hash() const { return _hash; }
915 void set_hash(unsigned int hash) { _hash = hash; }
917 SymbolHashMapEntry* next() const { return _next; }
918 void set_next(SymbolHashMapEntry* next) { _next = next; }
920 Symbol* symbol() const { return _symbol; }
921 void set_symbol(Symbol* sym) { _symbol = sym; }
923 u2 value() const { return _value; }
924 void set_value(u2 value) { _value = value; }
926 SymbolHashMapEntry(unsigned int hash, Symbol* symbol, u2 value)
927 : _hash(hash), _symbol(symbol), _value(value), _next(NULL) {}
929 }; // End SymbolHashMapEntry class
932 class SymbolHashMapBucket : public CHeapObj<mtSymbol> {
934 private:
935 SymbolHashMapEntry* _entry;
937 public:
938 SymbolHashMapEntry* entry() const { return _entry; }
939 void set_entry(SymbolHashMapEntry* entry) { _entry = entry; }
940 void clear() { _entry = NULL; }
942 }; // End SymbolHashMapBucket class
945 class SymbolHashMap: public CHeapObj<mtSymbol> {
947 private:
948 // Default number of entries in the table
949 enum SymbolHashMap_Constants {
950 _Def_HashMap_Size = 256
951 };
953 int _table_size;
954 SymbolHashMapBucket* _buckets;
956 void initialize_table(int table_size) {
957 _table_size = table_size;
958 _buckets = NEW_C_HEAP_ARRAY(SymbolHashMapBucket, table_size, mtSymbol);
959 for (int index = 0; index < table_size; index++) {
960 _buckets[index].clear();
961 }
962 }
964 public:
966 int table_size() const { return _table_size; }
968 SymbolHashMap() { initialize_table(_Def_HashMap_Size); }
969 SymbolHashMap(int table_size) { initialize_table(table_size); }
971 // hash P(31) from Kernighan & Ritchie
972 static unsigned int compute_hash(const char* str, int len) {
973 unsigned int hash = 0;
974 while (len-- > 0) {
975 hash = 31*hash + (unsigned) *str;
976 str++;
977 }
978 return hash;
979 }
981 SymbolHashMapEntry* bucket(int i) {
982 return _buckets[i].entry();
983 }
985 void add_entry(Symbol* sym, u2 value);
986 SymbolHashMapEntry* find_entry(Symbol* sym);
988 u2 symbol_to_value(Symbol* sym) {
989 SymbolHashMapEntry *entry = find_entry(sym);
990 return (entry == NULL) ? 0 : entry->value();
991 }
993 ~SymbolHashMap() {
994 SymbolHashMapEntry* next;
995 for (int i = 0; i < _table_size; i++) {
996 for (SymbolHashMapEntry* cur = bucket(i); cur != NULL; cur = next) {
997 next = cur->next();
998 delete(cur);
999 }
1000 }
1001 FREE_C_HEAP_ARRAY(SymbolHashMapBucket, _buckets, mtSymbol);
1002 }
1003 }; // End SymbolHashMap class
1005 #endif // SHARE_VM_OOPS_CONSTANTPOOLOOP_HPP